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References in Research – Types, Examples and Writing Guide

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References in Research

Definition:

References in research are a list of sources that a researcher has consulted or cited while conducting their study. They are an essential component of any academic work, including research papers, theses, dissertations, and other scholarly publications.

Types of References

There are several types of references used in research, and the type of reference depends on the source of information being cited. The most common types of references include:

References to books typically include the author’s name, title of the book, publisher, publication date, and place of publication.

Example: Smith, J. (2018). The Art of Writing. Penguin Books.

Journal Articles

References to journal articles usually include the author’s name, title of the article, name of the journal, volume and issue number, page numbers, and publication date.

Example: Johnson, T. (2021). The Impact of Social Media on Mental Health. Journal of Psychology, 32(4), 87-94.

Web sources

References to web sources should include the author or organization responsible for the content, the title of the page, the URL, and the date accessed.

Example: World Health Organization. (2020). Coronavirus disease (COVID-19) advice for the public. Retrieved from https://www.who.int/emergencies/disease/novel-coronavirus-2019/advice-for-public

Conference Proceedings

References to conference proceedings should include the author’s name, title of the paper, name of the conference, location of the conference, date of the conference, and page numbers.

Example: Chen, S., & Li, J. (2019). The Future of AI in Education. Proceedings of the International Conference on Educational Technology, Beijing, China, July 15-17, pp. 67-78.

References to reports typically include the author or organization responsible for the report, title of the report, publication date, and publisher.

Example: United Nations. (2020). The Sustainable Development Goals Report. United Nations.

Formats of References

Some common Formates of References with their examples are as follows:

APA (American Psychological Association) Style

The APA (American Psychological Association) Style has specific guidelines for formatting references used in academic papers, articles, and books. Here are the different reference formats in APA style with examples:

Author, A. A. (Year of publication). Title of book. Publisher.

Example : Smith, J. K. (2005). The psychology of social interaction. Wiley-Blackwell.

Journal Article

Author, A. A., Author, B. B., & Author, C. C. (Year of publication). Title of article. Title of Journal, volume number(issue number), page numbers.

Example : Brown, L. M., Keating, J. G., & Jones, S. M. (2012). The role of social support in coping with stress among African American adolescents. Journal of Research on Adolescence, 22(1), 218-233.

Author, A. A. (Year of publication or last update). Title of page. Website name. URL.

Example : Centers for Disease Control and Prevention. (2020, December 11). COVID-19: How to protect yourself and others. https://www.cdc.gov/coronavirus/2019-ncov/prevent-getting-sick/prevention.html

Magazine article

Author, A. A. (Year, Month Day of publication). Title of article. Title of Magazine, volume number(issue number), page numbers.

Example : Smith, M. (2019, March 11). The power of positive thinking. Psychology Today, 52(3), 60-65.

Newspaper article:

Author, A. A. (Year, Month Day of publication). Title of article. Title of Newspaper, page numbers.

Example: Johnson, B. (2021, February 15). New study shows benefits of exercise on mental health. The New York Times, A8.

Edited book

Editor, E. E. (Ed.). (Year of publication). Title of book. Publisher.

Example : Thompson, J. P. (Ed.). (2014). Social work in the 21st century. Sage Publications.

Chapter in an edited book:

Author, A. A. (Year of publication). Title of chapter. In E. E. Editor (Ed.), Title of book (pp. page numbers). Publisher.

Example : Johnson, K. S. (2018). The future of social work: Challenges and opportunities. In J. P. Thompson (Ed.), Social work in the 21st century (pp. 105-118). Sage Publications.

MLA (Modern Language Association) Style

The MLA (Modern Language Association) Style is a widely used style for writing academic papers and essays in the humanities. Here are the different reference formats in MLA style:

Author’s Last name, First name. Title of Book. Publisher, Publication year.

Example : Smith, John. The Psychology of Social Interaction. Wiley-Blackwell, 2005.

Journal article

Author’s Last name, First name. “Title of Article.” Title of Journal, volume number, issue number, Publication year, page numbers.

Example : Brown, Laura M., et al. “The Role of Social Support in Coping with Stress among African American Adolescents.” Journal of Research on Adolescence, vol. 22, no. 1, 2012, pp. 218-233.

Author’s Last name, First name. “Title of Webpage.” Website Name, Publication date, URL.

Example : Centers for Disease Control and Prevention. “COVID-19: How to Protect Yourself and Others.” CDC, 11 Dec. 2020, https://www.cdc.gov/coronavirus/2019-ncov/prevent-getting-sick/prevention.html.

Author’s Last name, First name. “Title of Article.” Title of Magazine, Publication date, page numbers.

Example : Smith, Mary. “The Power of Positive Thinking.” Psychology Today, Mar. 2019, pp. 60-65.

Newspaper article

Author’s Last name, First name. “Title of Article.” Title of Newspaper, Publication date, page numbers.

Example : Johnson, Bob. “New Study Shows Benefits of Exercise on Mental Health.” The New York Times, 15 Feb. 2021, p. A8.

Editor’s Last name, First name, editor. Title of Book. Publisher, Publication year.

Example : Thompson, John P., editor. Social Work in the 21st Century. Sage Publications, 2014.

Chapter in an edited book

Author’s Last name, First name. “Title of Chapter.” Title of Book, edited by Editor’s First Name Last name, Publisher, Publication year, page numbers.

Example : Johnson, Karen S. “The Future of Social Work: Challenges and Opportunities.” Social Work in the 21st Century, edited by John P. Thompson, Sage Publications, 2014, pp. 105-118.

Chicago Manual of Style

The Chicago Manual of Style is a widely used style for writing academic papers, dissertations, and books in the humanities and social sciences. Here are the different reference formats in Chicago style:

Example : Smith, John K. The Psychology of Social Interaction. Wiley-Blackwell, 2005.

Author’s Last name, First name. “Title of Article.” Title of Journal volume number, no. issue number (Publication year): page numbers.

Example : Brown, Laura M., John G. Keating, and Sarah M. Jones. “The Role of Social Support in Coping with Stress among African American Adolescents.” Journal of Research on Adolescence 22, no. 1 (2012): 218-233.

Author’s Last name, First name. “Title of Webpage.” Website Name. Publication date. URL.

Example : Centers for Disease Control and Prevention. “COVID-19: How to Protect Yourself and Others.” CDC. December 11, 2020. https://www.cdc.gov/coronavirus/2019-ncov/prevent-getting-sick/prevention.html.

Author’s Last name, First name. “Title of Article.” Title of Magazine, Publication date.

Example : Smith, Mary. “The Power of Positive Thinking.” Psychology Today, March 2019.

Author’s Last name, First name. “Title of Article.” Title of Newspaper, Publication date.

Example : Johnson, Bob. “New Study Shows Benefits of Exercise on Mental Health.” The New York Times, February 15, 2021.

Example : Thompson, John P., ed. Social Work in the 21st Century. Sage Publications, 2014.

Author’s Last name, First name. “Title of Chapter.” In Title of Book, edited by Editor’s First Name Last Name, page numbers. Publisher, Publication year.

Example : Johnson, Karen S. “The Future of Social Work: Challenges and Opportunities.” In Social Work in the 21st Century, edited by John P. Thompson, 105-118. Sage Publications, 2014.

Harvard Style

The Harvard Style, also known as the Author-Date System, is a widely used style for writing academic papers and essays in the social sciences. Here are the different reference formats in Harvard Style:

Author’s Last name, First name. Year of publication. Title of Book. Place of publication: Publisher.

Example : Smith, John. 2005. The Psychology of Social Interaction. Oxford: Wiley-Blackwell.

Author’s Last name, First name. Year of publication. “Title of Article.” Title of Journal volume number (issue number): page numbers.

Example: Brown, Laura M., John G. Keating, and Sarah M. Jones. 2012. “The Role of Social Support in Coping with Stress among African American Adolescents.” Journal of Research on Adolescence 22 (1): 218-233.

Author’s Last name, First name. Year of publication. “Title of Webpage.” Website Name. URL. Accessed date.

Example : Centers for Disease Control and Prevention. 2020. “COVID-19: How to Protect Yourself and Others.” CDC. https://www.cdc.gov/coronavirus/2019-ncov/prevent-getting-sick/prevention.html. Accessed April 1, 2023.

Author’s Last name, First name. Year of publication. “Title of Article.” Title of Magazine, month and date of publication.

Example : Smith, Mary. 2019. “The Power of Positive Thinking.” Psychology Today, March 2019.

Author’s Last name, First name. Year of publication. “Title of Article.” Title of Newspaper, month and date of publication.

Example : Johnson, Bob. 2021. “New Study Shows Benefits of Exercise on Mental Health.” The New York Times, February 15, 2021.

Editor’s Last name, First name, ed. Year of publication. Title of Book. Place of publication: Publisher.

Example : Thompson, John P., ed. 2014. Social Work in the 21st Century. Thousand Oaks, CA: Sage Publications.

Author’s Last name, First name. Year of publication. “Title of Chapter.” In Title of Book, edited by Editor’s First Name Last Name, page numbers. Place of publication: Publisher.

Example : Johnson, Karen S. 2014. “The Future of Social Work: Challenges and Opportunities.” In Social Work in the 21st Century, edited by John P. Thompson, 105-118. Thousand Oaks, CA: Sage Publications.

Vancouver Style

The Vancouver Style, also known as the Uniform Requirements for Manuscripts Submitted to Biomedical Journals, is a widely used style for writing academic papers in the biomedical sciences. Here are the different reference formats in Vancouver Style:

Author’s Last name, First name. Title of Book. Edition number. Place of publication: Publisher; Year of publication.

Example : Smith, John K. The Psychology of Social Interaction. 2nd ed. Oxford: Wiley-Blackwell; 2005.

Author’s Last name, First name. Title of Article. Abbreviated Journal Title. Year of publication; volume number(issue number):page numbers.

Example : Brown LM, Keating JG, Jones SM. The Role of Social Support in Coping with Stress among African American Adolescents. J Res Adolesc. 2012;22(1):218-233.

Author’s Last name, First name. Title of Webpage. Website Name [Internet]. Publication date. [cited date]. Available from: URL.

Example : Centers for Disease Control and Prevention. COVID-19: How to Protect Yourself and Others [Internet]. 2020 Dec 11. [cited 2023 Apr 1]. Available from: https://www.cdc.gov/coronavirus/2019-ncov/prevent-getting-sick/prevention.html.

Author’s Last name, First name. Title of Article. Title of Magazine. Year of publication; month and day of publication:page numbers.

Example : Smith M. The Power of Positive Thinking. Psychology Today. 2019 Mar 1:32-35.

Author’s Last name, First name. Title of Article. Title of Newspaper. Year of publication; month and day of publication:page numbers.

Example : Johnson B. New Study Shows Benefits of Exercise on Mental Health. The New York Times. 2021 Feb 15:A4.

Editor’s Last name, First name, editor. Title of Book. Edition number. Place of publication: Publisher; Year of publication.

Example: Thompson JP, editor. Social Work in the 21st Century. 1st ed. Thousand Oaks, CA: Sage Publications; 2014.

Author’s Last name, First name. Title of Chapter. In: Editor’s Last name, First name, editor. Title of Book. Edition number. Place of publication: Publisher; Year of publication. page numbers.

Example : Johnson KS. The Future of Social Work: Challenges and Opportunities. In: Thompson JP, editor. Social Work in the 21st Century. 1st ed. Thousand Oaks, CA: Sage Publications; 2014. p. 105-118.

Turabian Style

Turabian style is a variation of the Chicago style used in academic writing, particularly in the fields of history and humanities. Here are the different reference formats in Turabian style:

Author’s Last name, First name. Title of Book. Place of publication: Publisher, Year of publication.

Example : Smith, John K. The Psychology of Social Interaction. Oxford: Wiley-Blackwell, 2005.

Author’s Last name, First name. “Title of Article.” Title of Journal volume number, no. issue number (Year of publication): page numbers.

Example : Brown, LM, Keating, JG, Jones, SM. “The Role of Social Support in Coping with Stress among African American Adolescents.” J Res Adolesc 22, no. 1 (2012): 218-233.

Author’s Last name, First name. “Title of Webpage.” Name of Website. Publication date. Accessed date. URL.

Example : Centers for Disease Control and Prevention. “COVID-19: How to Protect Yourself and Others.” CDC. December 11, 2020. Accessed April 1, 2023. https://www.cdc.gov/coronavirus/2019-ncov/prevent-getting-sick/prevention.html.

Author’s Last name, First name. “Title of Article.” Title of Magazine, Month Day, Year of publication, page numbers.

Example : Smith, M. “The Power of Positive Thinking.” Psychology Today, March 1, 2019, 32-35.

Author’s Last name, First name. “Title of Article.” Title of Newspaper, Month Day, Year of publication.

Example : Johnson, B. “New Study Shows Benefits of Exercise on Mental Health.” The New York Times, February 15, 2021.

Editor’s Last name, First name, ed. Title of Book. Place of publication: Publisher, Year of publication.

Example : Thompson, JP, ed. Social Work in the 21st Century. Thousand Oaks, CA: Sage Publications, 2014.

Author’s Last name, First name. “Title of Chapter.” In Title of Book, edited by Editor’s Last name, First name, page numbers. Place of publication: Publisher, Year of publication.

Example : Johnson, KS. “The Future of Social Work: Challenges and Opportunities.” In Social Work in the 21st Century, edited by Thompson, JP, 105-118. Thousand Oaks, CA: Sage Publications, 2014.

IEEE (Institute of Electrical and Electronics Engineers) Style

IEEE (Institute of Electrical and Electronics Engineers) style is commonly used in engineering, computer science, and other technical fields. Here are the different reference formats in IEEE style:

Author’s Last name, First name. Book Title. Place of Publication: Publisher, Year of publication.

Example : Oppenheim, A. V., & Schafer, R. W. Discrete-Time Signal Processing. Upper Saddle River, NJ: Prentice Hall, 2010.

Author’s Last name, First name. “Title of Article.” Abbreviated Journal Title, vol. number, no. issue number, pp. page numbers, Month year of publication.

Example: Shannon, C. E. “A Mathematical Theory of Communication.” Bell System Technical Journal, vol. 27, no. 3, pp. 379-423, July 1948.

Conference paper

Author’s Last name, First name. “Title of Paper.” In Title of Conference Proceedings, Place of Conference, Date of Conference, pp. page numbers, Year of publication.

Example: Gupta, S., & Kumar, P. “An Improved System of Linear Discriminant Analysis for Face Recognition.” In Proceedings of the 2011 International Conference on Computer Science and Network Technology, Harbin, China, Dec. 2011, pp. 144-147.

Author’s Last name, First name. “Title of Webpage.” Name of Website. Date of publication or last update. Accessed date. URL.

Example : National Aeronautics and Space Administration. “Apollo 11.” NASA. July 20, 1969. Accessed April 1, 2023. https://www.nasa.gov/mission_pages/apollo/apollo11.html.

Technical report

Author’s Last name, First name. “Title of Report.” Name of Institution or Organization, Report number, Year of publication.

Example : Smith, J. R. “Development of a New Solar Panel Technology.” National Renewable Energy Laboratory, NREL/TP-6A20-51645, 2011.

Author’s Last name, First name. “Title of Patent.” Patent number, Issue date.

Example : Suzuki, H. “Method of Producing Carbon Nanotubes.” US Patent 7,151,019, December 19, 2006.

Standard Title. Standard number, Publication date.

Example : IEEE Standard for Floating-Point Arithmetic. IEEE Std 754-2008, August 29, 2008

ACS (American Chemical Society) Style

ACS (American Chemical Society) style is commonly used in chemistry and related fields. Here are the different reference formats in ACS style:

Author’s Last name, First name; Author’s Last name, First name. Title of Article. Abbreviated Journal Title Year, Volume, Page Numbers.

Example : Wang, Y.; Zhao, X.; Cui, Y.; Ma, Y. Facile Preparation of Fe3O4/graphene Composites Using a Hydrothermal Method for High-Performance Lithium Ion Batteries. ACS Appl. Mater. Interfaces 2012, 4, 2715-2721.

Author’s Last name, First name. Book Title; Publisher: Place of Publication, Year of Publication.

Example : Carey, F. A. Organic Chemistry; McGraw-Hill: New York, 2008.

Author’s Last name, First name. Chapter Title. In Book Title; Editor’s Last name, First name, Ed.; Publisher: Place of Publication, Year of Publication; Volume number, Chapter number, Page Numbers.

Example : Grossman, R. B. Analytical Chemistry of Aerosols. In Aerosol Measurement: Principles, Techniques, and Applications; Baron, P. A.; Willeke, K., Eds.; Wiley-Interscience: New York, 2001; Chapter 10, pp 395-424.

Author’s Last name, First name. Title of Webpage. Website Name, URL (accessed date).

Example : National Institute of Standards and Technology. Atomic Spectra Database. https://www.nist.gov/pml/atomic-spectra-database (accessed April 1, 2023).

Author’s Last name, First name. Patent Number. Patent Date.

Example : Liu, Y.; Huang, H.; Chen, H.; Zhang, W. US Patent 9,999,999, December 31, 2022.

Author’s Last name, First name; Author’s Last name, First name. Title of Article. In Title of Conference Proceedings, Publisher: Place of Publication, Year of Publication; Volume Number, Page Numbers.

Example : Jia, H.; Xu, S.; Wu, Y.; Wu, Z.; Tang, Y.; Huang, X. Fast Adsorption of Organic Pollutants by Graphene Oxide. In Proceedings of the 15th International Conference on Environmental Science and Technology, American Chemical Society: Washington, DC, 2017; Volume 1, pp 223-228.

AMA (American Medical Association) Style

AMA (American Medical Association) style is commonly used in medical and scientific fields. Here are the different reference formats in AMA style:

Author’s Last name, First name. Article Title. Journal Abbreviation. Year; Volume(Issue):Page Numbers.

Example : Jones, R. A.; Smith, B. C. The Role of Vitamin D in Maintaining Bone Health. JAMA. 2019;321(17):1765-1773.

Author’s Last name, First name. Book Title. Edition number. Place of Publication: Publisher; Year.

Example : Guyton, A. C.; Hall, J. E. Textbook of Medical Physiology. 13th ed. Philadelphia, PA: Saunders; 2015.

Author’s Last name, First name. Chapter Title. In: Editor’s Last name, First name, ed. Book Title. Edition number. Place of Publication: Publisher; Year: Page Numbers.

Example: Rajakumar, K. Vitamin D and Bone Health. In: Holick, M. F., ed. Vitamin D: Physiology, Molecular Biology, and Clinical Applications. 2nd ed. New York, NY: Springer; 2010:211-222.

Author’s Last name, First name. Webpage Title. Website Name. URL. Published date. Updated date. Accessed date.

Example : National Cancer Institute. Breast Cancer Prevention (PDQ®)–Patient Version. National Cancer Institute. https://www.cancer.gov/types/breast/patient/breast-prevention-pdq. Published October 11, 2022. Accessed April 1, 2023.

Author’s Last name, First name. Conference presentation title. In: Conference Title; Conference Date; Place of Conference.

Example : Smith, J. R. Vitamin D and Bone Health: A Meta-Analysis. In: Proceedings of the Annual Meeting of the American Society for Bone and Mineral Research; September 20-23, 2022; San Diego, CA.

Thesis or dissertation

Author’s Last name, First name. Title of Thesis or Dissertation. Degree level [Doctoral dissertation or Master’s thesis]. University Name; Year.

Example : Wilson, S. A. The Effects of Vitamin D Supplementation on Bone Health in Postmenopausal Women [Doctoral dissertation]. University of California, Los Angeles; 2018.

ASCE (American Society of Civil Engineers) Style

The ASCE (American Society of Civil Engineers) style is commonly used in civil engineering fields. Here are the different reference formats in ASCE style:

Author’s Last name, First name. “Article Title.” Journal Title, volume number, issue number (year): page numbers. DOI or URL (if available).

Example : Smith, J. R. “Evaluation of the Effectiveness of Sustainable Drainage Systems in Urban Areas.” Journal of Environmental Engineering, vol. 146, no. 3 (2020): 04020010. https://doi.org/10.1061/(ASCE)EE.1943-7870.0001668.

Example : McCuen, R. H. Hydrologic Analysis and Design. 4th ed. Upper Saddle River, NJ: Pearson Education; 2013.

Author’s Last name, First name. “Chapter Title.” In: Editor’s Last name, First name, ed. Book Title. Edition number. Place of Publication: Publisher; Year: page numbers.

Example : Maidment, D. R. “Floodplain Management in the United States.” In: Shroder, J. F., ed. Treatise on Geomorphology. San Diego, CA: Academic Press; 2013: 447-460.

Author’s Last name, First name. “Paper Title.” In: Conference Title; Conference Date; Location. Place of Publication: Publisher; Year: page numbers.

Example: Smith, J. R. “Sustainable Drainage Systems for Urban Areas.” In: Proceedings of the ASCE International Conference on Sustainable Infrastructure; November 6-9, 2019; Los Angeles, CA. Reston, VA: American Society of Civil Engineers; 2019: 156-163.

Author’s Last name, First name. “Report Title.” Report number. Place of Publication: Publisher; Year.

Example : U.S. Army Corps of Engineers. “Hurricane Sandy Coastal Risk Reduction Program, New York and New Jersey.” Report No. P-15-001. Washington, DC: U.S. Army Corps of Engineers; 2015.

CSE (Council of Science Editors) Style

The CSE (Council of Science Editors) style is commonly used in the scientific and medical fields. Here are the different reference formats in CSE style:

Author’s Last name, First Initial. Middle Initial. “Article Title.” Journal Title. Year;Volume(Issue):Page numbers.

Example : Smith, J.R. “Evaluation of the Effectiveness of Sustainable Drainage Systems in Urban Areas.” Journal of Environmental Engineering. 2020;146(3):04020010.

Author’s Last name, First Initial. Middle Initial. Book Title. Edition number. Place of Publication: Publisher; Year.

Author’s Last name, First Initial. Middle Initial. “Chapter Title.” In: Editor’s Last name, First Initial. Middle Initial., ed. Book Title. Edition number. Place of Publication: Publisher; Year:Page numbers.

Author’s Last name, First Initial. Middle Initial. “Paper Title.” In: Conference Title; Conference Date; Location. Place of Publication: Publisher; Year.

Example : Smith, J.R. “Sustainable Drainage Systems for Urban Areas.” In: Proceedings of the ASCE International Conference on Sustainable Infrastructure; November 6-9, 2019; Los Angeles, CA. Reston, VA: American Society of Civil Engineers; 2019.

Author’s Last name, First Initial. Middle Initial. “Report Title.” Report number. Place of Publication: Publisher; Year.

Bluebook Style

The Bluebook style is commonly used in the legal field for citing legal documents and sources. Here are the different reference formats in Bluebook style:

Case citation

Case name, volume source page (Court year).

Example : Brown v. Board of Education, 347 U.S. 483 (1954).

Statute citation

Name of Act, volume source § section number (year).

Example : Clean Air Act, 42 U.S.C. § 7401 (1963).

Regulation citation

Name of regulation, volume source § section number (year).

Example: Clean Air Act, 40 C.F.R. § 52.01 (2019).

Book citation

Author’s Last name, First Initial. Middle Initial. Book Title. Edition number (if applicable). Place of Publication: Publisher; Year.

Example: Smith, J.R. Legal Writing and Analysis. 3rd ed. New York, NY: Aspen Publishers; 2015.

Journal article citation

Author’s Last name, First Initial. Middle Initial. “Article Title.” Journal Title. Volume number (year): first page-last page.

Example: Garcia, C. “The Right to Counsel: An International Comparison.” International Journal of Legal Information. 43 (2015): 63-94.

Website citation

Author’s Last name, First Initial. Middle Initial. “Page Title.” Website Title. URL (accessed month day, year).

Example : United Nations. “Universal Declaration of Human Rights.” United Nations. https://www.un.org/en/universal-declaration-human-rights/ (accessed January 3, 2023).

Oxford Style

The Oxford style, also known as the Oxford referencing system or the documentary-note citation system, is commonly used in the humanities, including literature, history, and philosophy. Here are the different reference formats in Oxford style:

Author’s Last name, First name. Book Title. Place of Publication: Publisher, Year of Publication.

Example : Smith, John. The Art of Writing. New York: Penguin, 2020.

Author’s Last name, First name. “Article Title.” Journal Title volume, no. issue (year): page range.

Example: Garcia, Carlos. “The Role of Ethics in Philosophy.” Philosophy Today 67, no. 3 (2019): 53-68.

Chapter in an edited book citation

Author’s Last name, First name. “Chapter Title.” In Book Title, edited by Editor’s Name, page range. Place of Publication: Publisher, Year of Publication.

Example : Lee, Mary. “Feminism in the 21st Century.” In The Oxford Handbook of Feminism, edited by Jane Smith, 51-69. Oxford: Oxford University Press, 2018.

Author’s Last name, First name. “Page Title.” Website Title. URL (accessed day month year).

Example : Jones, David. “The Importance of Learning Languages.” Oxford Language Center. https://www.oxfordlanguagecenter.com/importance-of-learning-languages/ (accessed 3 January 2023).

Dissertation or thesis citation

Author’s Last name, First name. “Title of Dissertation/Thesis.” PhD diss., University Name, Year of Publication.

Example : Brown, Susan. “The Art of Storytelling in American Literature.” PhD diss., University of Oxford, 2020.

Newspaper article citation

Author’s Last name, First name. “Article Title.” Newspaper Title, Month Day, Year.

Example : Robinson, Andrew. “New Developments in Climate Change Research.” The Guardian, September 15, 2022.

AAA (American Anthropological Association) Style

The American Anthropological Association (AAA) style is commonly used in anthropology research papers and journals. Here are the different reference formats in AAA style:

Author’s Last name, First name. Year of Publication. Book Title. Place of Publication: Publisher.

Example : Smith, John. 2019. The Anthropology of Food. New York: Routledge.

Author’s Last name, First name. Year of Publication. “Article Title.” Journal Title volume, no. issue: page range.

Example : Garcia, Carlos. 2021. “The Role of Ethics in Anthropology.” American Anthropologist 123, no. 2: 237-251.

Author’s Last name, First name. Year of Publication. “Chapter Title.” In Book Title, edited by Editor’s Name, page range. Place of Publication: Publisher.

Example: Lee, Mary. 2018. “Feminism in Anthropology.” In The Oxford Handbook of Feminism, edited by Jane Smith, 51-69. Oxford: Oxford University Press.

Author’s Last name, First name. Year of Publication. “Page Title.” Website Title. URL (accessed day month year).

Example : Jones, David. 2020. “The Importance of Learning Languages.” Oxford Language Center. https://www.oxfordlanguagecenter.com/importance-of-learning-languages/ (accessed January 3, 2023).

Author’s Last name, First name. Year of Publication. “Title of Dissertation/Thesis.” PhD diss., University Name.

Example : Brown, Susan. 2022. “The Art of Storytelling in Anthropology.” PhD diss., University of California, Berkeley.

Author’s Last name, First name. Year of Publication. “Article Title.” Newspaper Title, Month Day.

Example : Robinson, Andrew. 2021. “New Developments in Anthropology Research.” The Guardian, September 15.

AIP (American Institute of Physics) Style

The American Institute of Physics (AIP) style is commonly used in physics research papers and journals. Here are the different reference formats in AIP style:

Example : Johnson, S. D. 2021. “Quantum Computing and Information.” Journal of Applied Physics 129, no. 4: 043102.

Example : Feynman, Richard. 2018. The Feynman Lectures on Physics. New York: Basic Books.

Example : Jones, David. 2020. “The Future of Quantum Computing.” In The Handbook of Physics, edited by John Smith, 125-136. Oxford: Oxford University Press.

Conference proceedings citation

Author’s Last name, First name. Year of Publication. “Title of Paper.” Proceedings of Conference Name, date and location: page range. Place of Publication: Publisher.

Example : Chen, Wei. 2019. “The Applications of Nanotechnology in Solar Cells.” Proceedings of the 8th International Conference on Nanotechnology, July 15-17, Tokyo, Japan: 224-229. New York: AIP Publishing.

Example : American Institute of Physics. 2022. “About AIP Publishing.” AIP Publishing. https://publishing.aip.org/about-aip-publishing/ (accessed January 3, 2023).

Patent citation

Author’s Last name, First name. Year of Publication. Patent Number.

Example : Smith, John. 2018. US Patent 9,873,644.

References Writing Guide

Here are some general guidelines for writing references:

• Follow the citation style guidelines: Different disciplines and journals may require different citation styles (e.g., APA, MLA, Chicago). It is important to follow the specific guidelines for the citation style required.
• Include all necessary information : Each citation should include enough information for readers to locate the source. For example, a journal article citation should include the author(s), title of the article, journal title, volume number, issue number, page numbers, and publication year.
• Use proper formatting: Citation styles typically have specific formatting requirements for different types of sources. Make sure to follow the proper formatting for each citation.
• Order citations alphabetically: If listing multiple sources, they should be listed alphabetically by the author’s last name.
• Be consistent: Use the same citation style throughout the entire paper or project.
• Check for accuracy: Double-check all citations to ensure accuracy, including correct spelling of author names and publication information.
• Use reputable sources: When selecting sources to cite, choose reputable and authoritative sources. Avoid sources that are biased or unreliable.
• Include all sources: Make sure to include all sources used in the research, including those that were not directly quoted but still informed the work.
• Use online tools : There are online tools available (e.g., citation generators) that can help with formatting and organizing references.

Purpose of References in Research

References in research serve several purposes:

• To give credit to the original authors or sources of information used in the research. It is important to acknowledge the work of others and avoid plagiarism.
• To provide evidence for the claims made in the research. References can support the arguments, hypotheses, or conclusions presented in the research by citing relevant studies, data, or theories.
• To allow readers to find and verify the sources used in the research. References provide the necessary information for readers to locate and access the sources cited in the research, which allows them to evaluate the quality and reliability of the information presented.
• To situate the research within the broader context of the field. References can show how the research builds on or contributes to the existing body of knowledge, and can help readers to identify gaps in the literature that the research seeks to address.

Importance of References in Research

References play an important role in research for several reasons:

• Credibility : By citing authoritative sources, references lend credibility to the research and its claims. They provide evidence that the research is based on a sound foundation of knowledge and has been carefully researched.
• Avoidance of Plagiarism : References help researchers avoid plagiarism by giving credit to the original authors or sources of information. This is important for ethical reasons and also to avoid legal repercussions.
• Reproducibility : References allow others to reproduce the research by providing detailed information on the sources used. This is important for verification of the research and for others to build on the work.
• Context : References provide context for the research by situating it within the broader body of knowledge in the field. They help researchers to understand where their work fits in and how it builds on or contributes to existing knowledge.
• Evaluation : References provide a means for others to evaluate the research by allowing them to assess the quality and reliability of the sources used.

Advantages of References in Research

There are several advantages of including references in research:

• Acknowledgment of Sources: Including references gives credit to the authors or sources of information used in the research. This is important to acknowledge the original work and avoid plagiarism.
• Evidence and Support : References can provide evidence to support the arguments, hypotheses, or conclusions presented in the research. This can add credibility and strength to the research.
• Reproducibility : References provide the necessary information for others to reproduce the research. This is important for the verification of the research and for others to build on the work.
• Context : References can help to situate the research within the broader body of knowledge in the field. This helps researchers to understand where their work fits in and how it builds on or contributes to existing knowledge.
• Evaluation : Including references allows others to evaluate the research by providing a means to assess the quality and reliability of the sources used.
• Ongoing Conversation: References allow researchers to engage in ongoing conversations and debates within their fields. They can show how the research builds on or contributes to the existing body of knowledge.

About the author

Muhammad Hassan

Researcher, Academic Writer, Web developer

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Introduction to Reference, Bibliography, and Citation

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Agrawal, A. (2009). Introduction to Reference, Bibliography, and Citation. In: EndNote 1 - 2 - 3 Easy!. Springer, Boston, MA. https://doi.org/10.1007/978-0-387-95901-6_1

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Home / Guides / Citation Guides / Harvard Referencing / Harvard Referencing Style Examples / How to reference a PDF in Harvard referencing style

How to reference a PDF in Harvard referencing style

This guide covers how to reference PDFs in Harvard style. PDF stands for ‘portable document format’ and is one of the most reliable formats to export read-only documents and share with others or release publicly while retaining the layout of a page.  

You’ll often find PDFs on the internet. It is common for journal articles, reports, and other similar documents to be posted in PDF format. As a general rule, you’ll simply include the link to the PDF in your reference, which will take your reader directly to the PDF you are citing. The rest of your reference will follow the rules for the particular type of source you are citing.

How to cite a PDF in Harvard referencing style  

General citation structure  .

The in-text citations remain the same for most PDFs, as the in-text reference generally uses the author name (or company name) and year of publication.  

In-text citation template:

(Author Surname, Publication Year)

(Mukherjee, 2015)

Reference list template:

Author Surname, Initial(s)./Company Name (Publication year) Title.   Available at: URL (Accessed: Date).

Kelly Services (2020) 2019 annual report . Available at: http://annualreports.co.uk/HostedData/AnnualReports/PDF/NASDAQ_KELYA_2019.pdf (Accessed: 13 October 2020).

PDF with multiple authors

You’ll often find journal articles published in PDF format. You should point the reader to where you found your source, even if it is not on the official journal page. For a PDF with two or three authors, follow the standard Harvard style. The following example shows you how to cite a journal article with a direct link to a PDF. Alternatively, you could replace the PDF link with the DOI. It is important to use a reference structure that matches the type of source you are citing (here, a journal article).

(Author 1 Surname and Author 2 Surname, Publication year)

(Langhans and Romps, 2015)

Reference list:  

Author 1 Surname, Author 1 Initial(s). and Author 2 Surname, Author 2 Initial(s). (Publication year) ‘Title of article’, Journal Title , Issue information, pp. XX-XX. Available at: URL (Accessed: Date).

Langhans, W. and Romps, D.M. (2015) ‘The origin of water vapor rings in tropical oceanic cold pools’, Geophysical Research Letters , 42, pp. 7825-7834. Available at: https://agupubs.onlinelibrary.wiley.com/doi/pdfdirect/10.1002/2015GL065623 (Accessed: 8 December 2016).

Referencing a PDF with four or more authors

If your source has four or more authors, you’ll use the first author’s surname followed by et al. in your in-text citation. Your reference list can also use et al . or, if your institution requires it, a listing of each author in the full reference.

In-text citation structure:

(Author 1 Surname et al. , Year of publication)

(Thacker et al. , 2003)

Reference list example:

Thacker, S.B. et al. (2003) ‘The Impact of Stretching on Sports Injury Risk: A Systematic Review of the Literature’, Medicine & Science in Sports & Exercise , 36(3), pp. 371-378 . Available at: https://www.dr-moosburger.at/wp-content/uploads/pub102.pdf (Accessed: 5 February 2006).

Published October 29, 2020.

Harvard Formatting Guide

Harvard Formatting

• et al Usage
• Direct Quotes
• In-text Citations
• Multiple Authors
• Page Numbers
• Writing an Outline
• View Harvard Guide

Reference Examples

• View all Harvard Examples

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Referencing and citations

Advice and resources to support you with referencing and citations, and avoiding plagiarism.

At university you are expected to read and research, and then use the ideas, information, data and a range of other sources in your own academic work and assignments. However, it is important to make absolutely clear where each idea or piece of information comes from by referencing it (giving your sources) in your own work.

What is referencing? (PDF)

What is referencing? (Word rtf)

When done properly, reference adds credibility and strength to your arguments, as well as demonstrating the effort that you have put into research and reading. There is more information on using your reading and developing your argument in the Reading at university and Academic writing pages.

Reading at university

Academic Writing

Different subjects and disciplines use different referencing styles (or systems). You may even find that different assignments on a course use different styles, depending on the format of the assignment. The different styles, e.g. Harvard, Chicago, OSCOLA, look very different. But when and why you need to reference does not change. There is further information on Different styles in the Go further section of this page.

You need to make sure you know how you are being expected to do this and you should refer to your course, assignment, or programme information provided by your School about what style you are expected to use. If you are unsure, you need to ask someone who teaches you.

Citations vs references

In your work, you need to explicitly indicate and acknowledge when you have used or referred to someone else’s idea or data etc. However, if you were to include the full reference (or bibliographic details) of your evidence, it would disrupt the flow of your argument.

Instead, it is academic convention to give an abbreviated version of the reference details at the point it is being discussed. This is known as a citation or in-text citing. The citation should make an explicit link between the point being presented or discussed, and the evidence you are using.

A reference is the full bibliographic or publication details of a citation. Whilst the in-text citation tells your audience that there is evidence to support your point, the reference gives them all the information they would need to find that evidence and review it themselves. You may cite the same source several times in your argument, however it only needs one reference as it is the same source each time.

Typically, the references of all your citations are collated at the end of a piece of work. Depending on your discipline and the style you are using this may be called a reference list (or works cited ), or a bibliography . Everything you’ve cited in your work must be included in the references or bibliography. However, in some subjects, a bibliography may also include other sources which you have consulted but have not cited in your work. You need to check the information provided by your course or School about what is required.

Tips for accurate referencing (PDF)

Tips for accurate referencing (Word rtf)

Most word processing software has a citation or referencing function so you do not necessarily have to format them all yourself. However you will still need to check that the software has done it properly and in the style that is required. You should be able to find instructions on how to do this for your software in the Help section or by searching online.

It is your responsibility to ensure the accuracy and adequacy of your citations and references. You need to make sure that your citations unambiguously link to the correct reference. You also need to make sure that you have citations everywhere they are needed. If you forget or miss a citation, then the impression you are giving is that the work is your own, when it is in fact someone else’s.

This is called plagiarism and is a form of academic misconduct. Typically plagiarism is due to unintentional, inadequate referencing, but it can also be deliberate.

What is plagiarism? (PDF)

What is plagiarism? (Word rtf)

You should also read the University of Edinburgh’s official guidance and policy on plagiarism:

Academic Services – Plagiarism

The Good academic practice page has additional information and guidance on what’s expected, academic misconduct and support.

Good academic practice

Different styles

The way a reference is abbreviated into a citation, and the format of the bibliographic details at the end of your work differ, depending which style (or system) you are using. Styles generally fall into two categories and relate to what the in-text citation looks like:

• Author-date e.g. APA, Harvard,
• Numeric e.g. Chicago notes and bibliography (NB) format, OSCOLA and Vancouver.

Some styles also include footnotes, which have a distinct purpose and format depending on the style. Be sure to check course or assignment information on if and how to use footnotes.

Information Services provide access to Cite Them Right online, which offers guidance and examples of how to cite and reference different sources (e.g. journal articles, books, web pages) in different styles. If you are not on the University network, you may need to login in via your institution for full access.

Cite Them Right

Reference managers

Once you are accustomed to referencing (including when you need to do it and what it needs to look like), you could start to use a reference manager. Reference management software can automatically format citations and build a reference list or bibliography for you. They can also allow you to store, annotate and groups references in your own personal database. The Academic Support Librarians have put together a Referencing and reference management subject guide with information on the different tools and training available.

Referencing and reference management

This article was published on 2024-02-26

How to Cite a PDF

Create citations for free.

Website Book Journal PDF

So you want to cite a PDF (or a Portable Document Format) file, but don’t know what citation format to use.

Citing PDFs can be a seemingly tricky part of writing a paper. Once you understand the process behind it, however, it becomes a very simple task.

The key to understanding how to cite a PDF is:

Always cite the PDF based on what source the file actually is .

A PDF, after all, is not really a source itself, but rather a file type and a way to display a source.

For example, if the source you wish to cite is a PDF of a newspaper article, cite the source as you would a newspaper.

Then, depending on the citation style you are using, you can add a short note to the citation that indicates that the source was in PDF, or you can include a URL that links directly to the PDF. Here is how you would do this in the three most popular citation styles:

• In a MLA citation , to cite a downloaded PDF, change the medium description to “PDF download.” To cite a PDF file available to view online, change the location description to the URL leading to the PDF.
• In an APA citation , cite a PDF the same way you would cite a webpage, including the URL leading to the PDF.
• In a Chicago-style citation, after the title, add the same description without brackets (separated by a period).

MLA Format Example

Downloaded PDF:

Executive summary. 2017 Trust Fund Annual Report , The World Bank Group, 2017. The World Bank Group , 2017, www.worldbank.org/en/publication/trust-fund-annual-report-2017/2017-trust-fund-annual-report/executive-summary. PDF download.

URL leading to the PDF:

Executive summary. 2017 Trust Fund Annual Report , The World Bank Group, 2017, documents1.worldbank.org/curated/en/428511521809720471/683696272_201803110085432/additional/124547-REVISED-PUBLIC-17045-TF-Annual-Report-web-Apr17.pdf.

If you need help with in-text and parenthetical citations, CitationMachine.net, can help. Our MLA citation generator is simple and easy to use!

APA Format Example

Fox, M. (2008). Indiana income limits. Indiana Government Information. https://www.huduser.org/Datasets/IL/IL08/in_fy2008.pdf

Chicago Format Example

  Reilly, Robert.  Complicated Relationships . PDF file. September 20, 2017. www.complicatedrelationships.com/amazon.pdf.

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There is no explicit way to indicate that you are citing a PDF, as PDF is a file format and not a type of reference (e.g., journal article, book, or book chapter). You can cite any reference type in PDF format (e.g., magazine articles and reports). To cite a PDF in APA format, cite it in a webpage style. Include a URL, which takes the user to the PDF. Following are a template and example on how to cite a PDF in APA format.

Surname, F. M. or Name of Group. (Publication Date). Title of the report . Publisher (if different from author). URL

California Air Resources Board [CARB]. (2017). California’s 2017 climate change scoping plan . https://ww3.arb.ca.gov/cc/scopingplan/scoping_plan_2017.pdf

To cite a PDF in Chicago (notes-bibliography) style, include the names of the contributors, title of the PDF, publisher, publication date, and URL. Cite a PDF similar to an online book. Following are a template and example for how to cite a PDF in Chicago style.

Footnote template:

This is an example sentence. 1

———-

• Author First Name Surname/Organization Name, Title of the PDF (Publisher, Publication Date), URL.

Footnote example:

It is reported by JPI Cultural Heritage. 1

• Joint Programming Initiative on Cultural Heritage and Global Change, Strategic Research and Innovation Agenda 2020 (JPI Cultural Heritage, May 2020), http://jpi-ch.eu/wp-content/uploads/2156_JPI-Cultural-Heritage.pdf.

Bibliography template and example: 

Author Surname, First Name Middle Initial/Organization Name. Title of the PDF. Publisher, publication date. URL.

Joint Programming Initiative on Cultural Heritage and Global Change.  Strategic Research and Innovation Agenda 2020. JPI Cultural Heritage, May 2020. http://jpi-ch.eu/wp-content/uploads/2156_JPI-Cultural-Heritage.pdf.

Purdue Online Writing Lab Purdue OWL® College of Liberal Arts

Reference List: Textual Sources

Welcome to the Purdue OWL

This page is brought to you by the OWL at Purdue University. When printing this page, you must include the entire legal notice.

Copyright ©1995-2018 by The Writing Lab & The OWL at Purdue and Purdue University. All rights reserved. This material may not be published, reproduced, broadcast, rewritten, or redistributed without permission. Use of this site constitutes acceptance of our terms and conditions of fair use.

Basic Format for Books

Edited book, no author, edited book with an author or authors, a translation.

Note : When you cite a republished work, like the one above, in your text, it should appear with both dates: Plato (385-378/1989)

Edition Other Than the First

Article or chapter in an edited book.

Note : When you list the pages of the chapter or essay in parentheses after the book title, use "pp." before the numbers: (pp. 1-21). This abbreviation, however, does not appear before the page numbers in periodical references, except for newspapers. List any edition number in the same set of parentheses as the page numbers, separated by a comma: (2nd ed., pp. 66-72).

Multivolume Work

Articles in periodicals.

APA style dictates that authors are named with their last name followed by their initials; publication year goes between parentheses, followed by a period. The title of the article is in sentence-case, meaning only the first word and proper nouns in the title are capitalized. The periodical title is run in title case, and is followed by the volume number which, with the title, is also italicized. If a DOI has been assigned to the article that you are using, you should include this after the page numbers for the article. If no DOI has been assigned and you are accessing the periodical online, use the URL of the website from which you are retrieving the periodical.

Article in Print Journal

Note: APA 7 advises writers to include a DOI (if available), even when using the print source. The example above assumes no DOI is available.

Article in Electronic Journal

Note :  This content also appears on Reference List: Online Media .

As noted above, when citing an article in an electronic journal, include a DOI if one is associated with the article.

DOIs may not always be available. In these cases, use a URL. Many academic journals provide stable URLs that function similarly to DOIs. These are preferable to ordinary URLs copied and pasted from the browser's address bar.

Article in a Magazine

Article in a newspaper.

• What's My Car Worth?
• Buyer's Guide

2024 Shelby Super Snake Unveiled as an 830-HP Mustang

The Super Snake is Shelby American's first time working with the S650 Mustang, and it's limited to 250 examples.

• The 5.0-liter V-8 powering the Super Snake offers 480 and 830-hp versions, the latter adding a 3.0-liter Whipple supercharger to reach the lofty figure.
• Other changes include a redesigned suspension, unique wheels, a Borla exhaust, stronger brakes, and better cooling.

Shelby American is entering the modern Mustang era with the introduction of the 2024 Super Snake based on the S650 generation. As with most cars to come out of the Shelby garage, the new Super Snake aims to elevate the performance and prestige of the donor car.

There are two engine options to choose from. Both are based on the Mustang's Coyote 5.0-liter V-8. The first option comes with the Mustang GT's standard 480 horsepower, while the second option adds a 3.0-liter Whipple supercharger and pushes firepower north of 830 ponies.

No matter which output you choose, the Super Snake features a redesigned suspension, unique wheels, a Borla exhaust, stronger brakes, and an upgraded cooling system. Either powertrain can be had with two or three pedals, though opting for the manual means the addition of a short-throw shifter and one-piece driveshaft.

"We designed the Shelby Super Snake to be the pinnacle of our performance cars based on Ford's world-class Mustang sports car," said Joe Conway, CEO of Shelby American. "It follows Carroll Shelby's vision that each generation of car improves the breed."

Performance upgrades don't stop there, either, with Shelby American shedding excess weight from the Mustang like a snake sheds its skin. The Super Snake gets a new aluminum hood, carbon-fiber front fenders for the widebody kit, a new front fascia, and new rockers. The wheels we mentioned earlier? Those shave roughly nine pounds from each corner.

Choosing between the coupe and convertible models also changes the rear spoiler setup. Opt for the fastback and you get a huge rear wing; go for the droptop and you'll receive a duckbill spoiler instead.

Interior upgrades are pretty minimal aside from Shelby logos replacing the usual Ford or Mustang-specific logos. As a bonus, Super Snake models equipped with a manual transmission get a unique Shelby gear shifter.

Pricing for the new Super Snake has yet to be revealed, but Shelby says production is planned to start this summer. The company is only planning to make 250 examples for the 2024 model year, so act quickly if you're interested.

Jack Fitzgerald’s love for cars stems from his as yet unshakable addiction to Formula 1. After a brief stint as a detailer for a local dealership group in college, he knew he needed a more permanent way to drive all the new cars he couldn’t afford and decided to pursue a career in auto writing. By hounding his college professors at the University of Wisconsin-Milwaukee, he was able to travel Wisconsin seeking out stories in the auto world before landing his dream job at Car and Driver . His new goal is to delay the inevitable demise of his 2010 Volkswagen Golf.

.css-1updq97:before{background-color:#000000;color:#fff;left:0;width:50%;border:0 solid transparent;bottom:48%;height:0.125rem;content:'';position:absolute;z-index:-2000000;} News .css-1e2ieb7:after{background-color:#000000;color:#fff;right:0;width:50%;border:0 solid transparent;bottom:48%;height:0.125rem;content:'';position:absolute;z-index:-2000000;}

Future EVs: Every Electric Vehicle Coming Soon

Beijing Auto Show: Domestic Brands Still Dominate

Buick Reveals Sexy EV Sedan and Wagon Concepts

New Defender Octa: The Most Powerful Defender Ever

Lotus Evija X Goes Third-Fastest at Nürburgring

Mazda EZ-6 Is the Mazda 6 Reincarnated as a RWD EV

New Ram RHO Is a V-8-Less TRX with a $26K Discount

2025 Lamborghini Urus SE is a 789-HP PHEV

Volkswagen ID.Code Concept Previews Autonomous EV

Mini Aceman Is a Tiny and Cheeky EV

2025 BMW i4, 4-Series Gran Coupe Get New Grilles

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Computer Science > Computation and Language

Title: "a good pun is its own reword": can large language models understand puns.

Abstract: Puns play a vital role in academic research due to their distinct structure and clear definition, which aid in the comprehensive analysis of linguistic humor. However, the understanding of puns in large language models (LLMs) has not been thoroughly examined, limiting their use in creative writing and humor creation. In this paper, we leverage three popular tasks, i.e., pun recognition, explanation and generation to systematically evaluate the capabilities of LLMs in pun understanding. In addition to adopting the automated evaluation metrics from prior research, we introduce new evaluation methods and metrics that are better suited to the in-context learning paradigm of LLMs. These new metrics offer a more rigorous assessment of an LLM's ability to understand puns and align more closely with human cognition than previous metrics. Our findings reveal the "lazy pun generation" pattern and identify the primary challenges LLMs encounter in understanding puns.

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