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Single Author

Last name first, followed by author initials.

Berndt, T. J. (2002). Friendship quality and social development. Current Directions in



Psychological Science, 11, 7-10.

Two Authors

List by their last names and initials. Use the ampersand instead of "and."

Wegener, D. T., & Petty, R. E. (1994). Mood management across affective states: The hedonic

contingency hypothesis. Journal of Personality & Social Psychology, 66, 1034-1048.



Three to Seven Authors

List by last names and initials; commas separate author names, while the last author name is preceded again by ampersand.

Kernis, M. H., Cornell, D. P., Sun, C. R., Berry, A., Harlow, T., & Bach, J. S. (1993). There's

more to self-esteem than whether it is high or low: The importance of stability of self-

esteem. Journal of Personality and Social Psychology, 65, 1190-1204.

More Than Seven Authors

Miller, F. H., Choi, M. J., Angeli, L. L., Harland, A. A., Stamos, J. A., Thomas, S. T., . . . Rubin,

L. H. (2009). Web site usability for the blind and low-vision user. Technical

Communication, 57, 323-335.

NOTE: Name the first six authors as normal, replace the ampersand (&) with an ellipse (…) and add the last author’s name.

NOTE also that in-text citations in the body of the paper for any resource with six or more authors should only contain the first author’s last name, then the term et al., as if you had already named all of the other authors previously (Miller et al., 2009).

Organization as Author

American Psychological Association. (2013). Diagnostic and statistical manual of mental disorders (5th ed.). Washington, DC: Author.



NOTE: When the publisher is also the corporate author, APA requires you to use the word "Author", see second-to-last bullet on page 187 of your APA Manual.
Unknown Author

Merriam-Webster's collegiate dictionary (10th ed.).(1993). Springfield, MA: Merriam-Webster.

NOTE: When your essay includes parenthetical citations of sources with no author named, use a shortened version of the source's title instead of an author's name. Use quotation marks and italics as appropriate. For example, parenthetical citations of the source above would appear as follows: (Merriam-Webster's, 1993).

Two or More Works by the Same Author

Use the author's name for all entries and list the entries by the year (earliest comes first).

Berndt, T. J. (1981). Age changes and changes over time in prosocial intentions and behavior

between friends. Developmental Psychology, 17, 408-416.

Berndt, T. J. (1999). Friends' influence on students' adjustment to school. Educational Psychologist, 34, 15-28.

When an author appears both as a sole author and, in another citation, as the first author of a group, list the one-author entries first.

Berndt, T. J. (1999). Friends' influence on students' adjustment to school. Educational

Psychologist, 34, 15-28.

Berndt, T. J., & Keefe, K. (1995). Friends' influence on adolescents' adjustment to school. Child



Development, 66, 1312-1329.

References that have the same first author and different second and/or third authors are arranged alphabetically by the last name of the second author, or the last name of the third if the first and second authors are the same.

Wegener, D. T., Kerr, N. L., Fleming, M. A., & Petty, R. E. (2000). Flexible corrections of juror

judgments: Implications for jury instructions. Psychology, Public Policy, & Law, 6, 629-

654.

Wegener, D. T., Petty, R. E., & Klein, D. J. (1994). Effects of mood on high elaboration attitude



change: The mediating role of likelihood judgments. European Journal of Social

Psychology, 24, 25-43.

Two or More Works by the Same Author in the Same Year

If you are using more than one reference by the same author (or the same group of authors listed in the same order) published in the same year, organize them in the reference list alphabetically by the title of the article or chapter. Then assign letter suffixes to the year. Refer to these sources in your essay as they appear in your reference list, e.g.: "Berdnt (1981a) makes similar claims..."

Berndt, T. J. (1981a). Age changes and changes over time in prosocial intentions and behavior

between friends. Developmental Psychology, 17, 408-416.

Berndt, T. J. (1981b). Effects of friendship on prosocial intentions and behavior. Child

Development, 52, 636-643.

Introductions, Prefaces, Forewords, and Afterwords

Cite the publishing information about a book as usual, but cite Introduction, Preface, Foreword, or Afterword (whatever title is applicable) as the chapter of the book.

Funk, R. & Kolln, M. (1998). Introduction. In E.W. Ludlow (Ed.), Understanding English

Grammar (pp. 1-2). Needham, MA: Allyn and Bacon.

The information for this section come from: http://owl.english.purdue.owl/resource/560/6/

Basic Format for Books


Author, A. A. (Year of publication). Title of work: Capital letter also for subtitle. Location: Publisher.

NOTE: For "Location," you should always list the city and the state using the two letter postal abbreviation without periods (New York, NY).
Calfee, R. C., & Valencia, R. R. (1991). APA guide to preparing manuscripts for journal publication. Washington, DC: American Psychological Association.

Edited Book, No Author


Duncan, G. J., & Brooks-Gunn, J. (Eds.). (1997). Consequences of growing up poor. New York, NY: Russell Sage Foundation.

Edited Book with an Author or Authors


Plath, S. (2000). The unabridged journals. K. V. Kukil (Ed.). New York, NY: Anchor.

A Translation


Laplace, P. S. (1951). A philosophical essay on probabilities. (F. W. Truscott & F. L. Emory, Trans.). New York, NY: Dover. (Original work published 1814)

NOTE: When you cite a republished work, like the one above, in your text, it should appear with both dates: Laplace (1814/1951).

Edition Other Than the First


Helfer, M. E., Kempe, R. S., & Krugman, R. D. (1997). The battered child (5th ed.). Chicago, IL: University of Chicago Press.


Article or Chapter in an Edited Book


Author, A. A., & Author, B. B. (Year of publication). Title of chapter. In A. A. Editor & B. B. Editor (Eds.), Title of book (pages of chapter). Location: Publisher.

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.
O'Neil, J. M., & Egan, J. (1992). Men's and women's gender role journeys: A metaphor for healing, transition, and transformation. In B. R. Wainrib (Ed.), Gender issues across the life cycle (pp. 107-123). New York, NY: Springer.

Multivolume Work


Wiener, P. (Ed.). (1973). Dictionary of the history of ideas (Vols. 1-4). New York, NY: Scribner's.

The information for this section comes from: https://owl.english.purdue.edu/owl/resource/560/08/

An Entry in an Encyclopedia


Bergmann, P. G. (1993). Relativity. In The New Encyclopedia  Britannica. (Vol. 26, pp. 501-508). Chicago, IL: Encyclopedia Britannica.

Work Discussed in a Secondary Source


List the source the work was discussed in:

Coltheart, M., Curtis, B., Atkins, P., & Haller, M. (1993). Models of reading aloud: Dual-route and parallel-distributed-processing approaches. Psychological Review, 100, 589-608.



NOTE: Give the secondary source in the references list; in the text, name the original work, and give a citation for the secondary source. For example, if Seidenberg and McClelland's work is cited in Coltheart et al. and you did not read the original work, list the Coltheart et al. reference in the References but not Seidenberg and McClelland. In the text, use the following citation:

In Seidenberg and McClelland's study (as cited in Coltheart, Curtis, Atkins, & Haller, 1993), ...


Dissertation Abstract


Yoshida, Y. (2001). Essays in urban transportation. Dissertation Abstracts International, 62, 7741A.

Dissertation, Published


Lastname, F. N. (Year). Title of dissertation (Doctoral dissertation). Retrieved from Name of database. (Accession or Order Number)

Dissertation, Unpublished


Lastname, F. N. (Year). Title of dissertation (Unpublished doctoral dissertation). Name of Institution, Location.

Government Document


National Institute of Mental Health. (1990). Clinical training in serious mental illness (DHHS Publication No. ADM 90-1679). Washington, DC: U.S. Government Printing Office.

For information about citing legal sources in your reference list, see the University of Nebraska, Kearney page on Citing Legal Materials in APA Style.


Report From a Private Organization


American Psychiatric Association. (2000). Practice guidelines for the treatment of patients with eating disorders (2nd ed.). Washington, DC: Author.

Conference Proceedings


Schnase, J. L., & Cunnius, E. L. (Eds.). (1995). Proceedings from CSCL '95: The First International Conference on Computer Support for Collaborative Learning. Mahwah, NJ: Erlbaum.

The information for this section comes from https://owl.english.purdue.edu/owl/resource/560/09/

Article From an Online Periodical

Online articles follow the same guidelines for printed articles. Include all information the online host makes available, including an issue number in parentheses.

Author, A. A., & Author, B. B. (Date of publication). Title of article. Title of Online Periodical, volume number(issue number if available). Retrieved from
http://www.someaddress.com/full/url/

Bernstein, M. (2002). 10 tips on writing the living Web. A List Apart: For People Who Make Websites, 149. Retrieved from http://www.alistapart.com/articles/writeliving



Online Scholarly Journal Article: Citing DOIs

Please note: In August of 2011 the formatting recommendations for DOIs changed. DOIs are now rendered as an alpha-numeric string which acts as an active link. According to The APA Style Guide to Electronic References, 6th edition, you should use the DOI format which the article appears with. So, if it is using the older numeric string, use that as the DOI. If, however, it is presented as the newer alpha-numeric string, use that as the DOI. The Purdue OWL maintains examples of citations using both DOI styles.

Because online materials can potentially change URLs, APA recommends providing a Digital Object Identifier (DOI), when it is available, as opposed to the URL. DOIs are an attempt to provide stable, long-lasting links for online articles. They are unique to their documents and consist of a long alphanumeric code. Many-but not all-publishers will provide an article's DOI on the first page of the document. 

Note that some online bibliographies provide an article's DOI but may "hide" the code under a button which may read "Article" or may be an abbreviation of a vendor's name like "CrossRef" or "PubMed." This button will usually lead the user to the full article which will include the DOI. Find DOI's from print publications or ones that go to dead links with CrossRef.org's "DOI Resolver," which is displayed in a central location on their home page.

Article From an Online Periodical with DOI Assigned

Author, A. A., & Author, B. B. (Date of publication). Title of article. Title of Journal, volume number, page range. doi:0000000/000000000000 or http://dx.doi.org/10.0000/0000

Brownlie, D. (2007). Toward effective poster presentations: An annotated bibliography. European Journal of Marketing, 41, 1245-1283. doi:10.1108/03090560710821161

Wooldridge, M.B., & Shapka, J. (2012). Playing with technology: Mother-toddler interaction scores lower during play with electronic toys. Journal of Applied Developmental Psychology, 33(5), 211-218. http://dx.doi.org/10.1016/j.appdev.2012.05.005



Article From an Online Periodical with no DOI Assigned

Online scholarly journal articles without a DOI require the URL of the journal home page. Remember that one goal of citations is to provide your readers with enough information to find the article; providing the journal home page aids readers in this process.

Author, A. A., & Author, B. B. (Date of publication). Title of article. Title of Journal, volume number. Retrieved from http://www.journalhomepage.com/full/url/

Kenneth, I. A. (2000). A Buddhist response to the nature of human rights. Journal of Buddhist Ethics, 8. Retrieved from http://www.cac.psu.edu/jbe/twocont.html



Article From a Database

Please note: APA states that including database information in citations is not necessary because databases change over time (p. 192). However, the OWL still includes information about databases for those users who need database information.

When referencing a print article obtained from an online database (such as a database in the library), provide appropriate print citation information (formatted just like a "normal" print citation would be for that type of work). By providing this information, you allow people to retrieve the print version if they do not have access to the database from which you retrieved the article. You can also include the item number or accession number or database URL at the end, but the APA manual says that this is not required.

If you are citing an article from a database that is available in other places, such as a journal or magazine, include the homepage's URL. You may have to do a web search of the article's title, author, etc. to find the URL.

For articles that are easily located, do not provide database information. If the article is difficult to locate, then you can provide database information. Only use retrieval dates if the source could change, such as Wikis. For more about citing articles retrieved from electronic databases, see pages 187-192 of the Publication Manual.

Author, A. A., & Author, B. B. (Date of publication). Title of article. Title of Journal, volume number, page range. Retrieved from http://www.someaddress.com/full/url/

Smyth, A. M., Parker, A. L., & Pease, D. L. (2002). A study of enjoyment of peas. Journal of Abnormal Eating, 8(3), 120-125. Retrieved from


http://www.articlehomepage.com/full/url/

Abstract

If you only cite an abstract but the full text of the article is also available, cite the online abstract as any other online citations, adding "[Abstract]" after the article or source name. However, if the full text is not available, you may use an abstract that is available through an abstracts database as a secondary source.

Paterson, P. (2008). How well do young offenders with Asperger Syndrome cope in custody?: Two prison case studies [Abstract]. British Journal of Learning Disabilities, 36(1), 54-58.

Hendricks, J., Applebaum, R., & Kunkel, S. (2010). A world apart? Bridging the gap between theory and applied social gerontology. Gerontologist, 50(3), 284-293. Abstract retrieved from Abstracts in Social Gerontology database. (Accession No. 50360869)



Newspaper Article

Author, A. A. (Year, Month Day). Title of article. Title of Newspaper. Retrieved from


http://www.someaddress.com/full/url/

Parker-Pope, T. (2008, May 6). Psychiatry handbook linked to drug industry. The New York Times. Retrieved from http://well.blogs.nytimes.com



Electronic Books

Electronic books may include books found on personal websites, databases, or even in audio form. Use the following format if the book you are using is only provided in a digital format or is difficult to find in print. If the work is not directly available online or must be purchased, use "Available from," rather than "Retrieved from," and point readers to where they can find it. For books available in print form and electronic form, include the publish date in parentheses after the author's name. For references to e-book editions, be sure to include the type and version of e-book you are references (e.g., "[Kindle DX version]"). If DOIs are available, provide them at the end of the reference.

De Huff, E. W. (n.d.). Taytay’s tales: Traditional Pueblo Indian tales. Retrieved from http://digital.library.upenn.edu/women/dehuff/taytay/taytay.html

Davis, J. (n.d.). Familiar birdsongs of the Northwest. Available from http://www.powells.com/cgi-bin/biblio?inkey=1-9780931686108-0



Chapter/Section of a Web Document or Online Book Chapter

Author, A. A., & Author, B. B. (Date of publication). Title of article. In Title of book or larger document (chapter or section number). Retrieved from http://www.someaddress.com/full/url/

Engelshcall, R. S. (1997). Module mod_rewrite: URL Rewriting Engine. In Apache HTTP Server Version 1.3 Documentation (Apache modules). Retrieved from http://httpd.apache.org/docs/1.3/mod/mod_rewrite.html

Peckinpaugh, J. (2003). Change in the Nineties. In J. S. Bough and G. B. DuBois (Eds.), A century of growth in America. Retrieved from GoldStar database.



NOTE: Use a chapter or section identifier and provide a URL that links directly to the chapter section, not the home page of the Web site.

Online Book Reviews

Cite the information as you normally would for the work you are quoting. (The first example below is from a newspaper article; the second is from a scholarly journal.) In brackets, write "Review of the book" and give the title of the reviewed work. Provide the web address after the words "Retrieved from," if the review is freely available to anyone. If the review comes from a subscription service or database, write "Available from" and provide the information where the review can be purchased.

Zacharek, S. (2008, April 27). Natural women [Review of the book Girls like us]. The New York Times. Retrieved from http://www.nytimes.com/2008/04/27/books/review/Zachareck
-t.html?pagewanted=2

Castle, G. (2007). New millennial Joyce [Review of the books Twenty-first Joyce, Joyce's critics: Transitions in reading and culture, and Joyce's messianism: Dante, negative existence, and the messianic self]. Modern Fiction Studies, 50(1), 163-173. Available from Project MUSE Web site: http://muse.jhu.edu/journals/modern_fiction_studies/toc/mfs52.1.html



Dissertation/Thesis from a Database

Biswas, S. (2008). Dopamine D3 receptor: A neuroprotective treatment target in Parkinson's disease. Retrieved from ProQuest Digital Dissertations. (AAT 3295214)



Online Encyclopedias and Dictionaries

Often encyclopedias and dictionaries do not provide bylines (authors' names). When no byline is present, move the entry name to the front of the citation. Provide publication dates if present or specify (n.d.) if no date is present in the entry.

Feminism. (n.d.). In Encyclopædia Britannica online. Retrieved from http://www.britannica. com/EBchecked/topic/724633/feminism

Online Bibliographies and Annotated Bibliographies

Jürgens, R. (2005). HIV/AIDS and HCV in Prisons: A Select Annotated Bibliography. Retrieved from http://www.hc-sc.gc.ca/ahc-asc/alt_formats/hpb-dgps/pdf/intactiv/hiv-vih-aids-sida-prison-carceral_e.pdf



Data Sets

Point readers to raw data by providing a Web address (use "Retrieved from") or a general place that houses data sets on the site (use "Available from").

United States Department of Housing and Urban Development. (2008). Indiana income limits [Data file]. Retrieved from http://www.huduser.org/Datasets/IL/IL08/in_fy2008.pdf

Graphic Data (e.g. Interactive Maps and Other Graphic Representations of Data)

Give the name of the researching organization followed by the date. In brackets, provide a brief explanation of what type of data is there and in what form it appears. Finally, provide the project name and retrieval information.

Solar Radiation and Climate Experiment. (2007). [Graph illustration the SORCE Spectral Plot May 8, 2008]. Solar Spectral Data Access from the SIM, SOLSTICE, and XPS Instruments. Retrieved from http://lasp.colorado.edu/cgi-bin/ion-p?page=input_data_for_ spectra.ion

Qualitative Data and Online Interviews

If an interview is not retrievable in audio or print form, cite the interview only in the text (not in the reference list) and provide the month, day, and year in the text. If an audio file or transcript is available online, use the following model, specifying the medium in brackets (e.g. [Interview transcript, Interview audio file]):

Butler, C. (Interviewer) & Stevenson, R. (Interviewee). (1999). Oral History 2 [Interview transcript]. Retrieved from Johnson Space Center Oral Histories Project Web site: http:// www11.jsc.nasa.gov/history/oral_histories/oral_histories.htm

Online Lecture Notes and Presentation Slides

When citing online lecture notes, be sure to provide the file format in brackets after the lecture title (e.g. PowerPoint slides, Word document).

Hallam, A. (n.d.) Duality in consumer theory [PDF document]. Retrieved from Lecture Notes Online Web site: http://www.econ.iastate.edu/classes/econ501/Hallam/
index.html

Roberts, K. F. (1998). Federal regulations of chemicals in the environment [PowerPoint slides]. Retrieved from http://siri.uvm.edu/ppt/40hrenv/index.html



Nonperiodical Web Document, Web Page, or Report

List as much of the following information as possible (you sometimes have to hunt around to find the information; don't be lazy. If there is a page like http://www.somesite.com/somepage.htm, and somepage.htm doesn't have the information you're looking for, move up the URL to http://www.somesite.com/):

Author, A. A., & Author, B. B. (Date of publication). Title of document. Retrieved from http://Web address

 Angeli, E., Wagner, J., Lawrick, E., Moore, K., Anderson, M., Soderland, L., & Brizee, A. (2010, May 5). General format. Retrieved from http://owl.english.purdue.edu/owl/resource/560/01/



NOTE: When an Internet document is more than one webpage, provide a URL that links to the home page or entry page for the document. Also, if there isn't a date available for the document use (n.d.) for no date.

Computer Software/Downloaded Software

Do not cite standard office software (e.g. Word, Excel) or programming languages. Provide references only for specialized software.

Ludwig, T. (2002). PsychInquiry [computer software]. New York: Worth.

Software that is downloaded from a Web site should provide the software’s version and year when available.

Hayes, B., Tesar, B., & Zuraw, K. (2003). OTSoft: Optimality Theory Software (Version 2.1) [Software]. Available from http://www.linguistics.ucla.edu/people/hayes/otsoft/

E-mail or other personal communication

E-mails and other personal communication (such as interviews) are not included in the list of references, though you parenthetically cite them in your main text, including the individual’s first initial and the complete date: (E. Robbins, personal communication, January 4, 2001).



Online Forum or Discussion Board Posting

Include the title of the message, and the URL of the newsgroup or discussion board. Please note that titles for items in online communities (e.g. blogs, newsgroups, forums) are not italicized. If the author's name is not available, provide the screen name. Place identifiers like post or message numbers, if available, in brackets. If available, provide the URL where the message is archived (e.g. "Message posted to..., archived at...").

Frook, B. D. (1999, July 23). New inventions in the cyberworld of toylandia [Msg 25]. Message posted to http://groups.earthlink.com/forum/messages/00025.html

Blog (Weblog) and Video Blog Post

Include the title of the message and the URL. Please note that titles for items in online communities (e.g. blogs, newsgroups, forums) are not italicized. If the author’s name is not available, provide the screen name.

J Dean. (2008, May 7). When the self emerges: Is that me in the mirror? [Web log comment]. Retrieved from http://www.spring.org.uk/the1sttransport 

Psychology Video Blog #3 [Video file]. Retrieved from http://www.youtube.com/watch?v=lqM90eQi5-M



Wikis

Please note that the APA Style Guide to Electronic References warns writers that wikis (like Wikipedia, for example) are collaborative projects that cannot guarantee the verifiability or expertise of their entries.

OLPC Peru/Arahuay. (n.d.). Retrieved April 29, 2011 from the OLPC Wiki: http://wiki.laptop. org/go/OLPC_Peru/Arahuay

Audio Podcast

For all podcasts, provide as much information as possible; not all of the following information will be available. Possible addition identifiers may include Producer, Director, etc.

Bell, T., & Phillips, T. (2008, May 6). A solar flare. Science @ NASA Podcast. Podcast retrieved from http://science.nasa.gov/podcast.htm

Video Podcasts

For all podcasts, provide as much information as possible; not all of the following information will be available. Possible addition identifiers may include Producer, Director, etc.

Scott, D. (Producer). (2007, January 5). The community college classroom [Episode 7]. Adventures in Education. Podcast retrieved from http://www.adveeducation.com

The information for this section comes from https://owl.english.purdue.edu/owl/resource/560/10/

Interviews, Email, and Other Personal Communication

No personal communication is included in your reference list; instead, parenthetically cite the communicator's name, the phrase "personal communication," and the date of the communication in your main text only.

(E. Robbins, personal communication, January 4, 2001).

A. P. Smith also claimed that many of her students had difficulties with APA style (personal communication, November 3, 2002).



Motion Picture

Basic reference list format:

Producer, P. P. (Producer), & Director, D. D. (Director). (Date of publication). Title of motion picture [Motion picture]. Country of origin: Studio or distributor.

NOTE: If a movie or video tape is not available in wide distribution, add the following to your citation after the country of origin: (Available from Distributor name, full address and zip code).

A Motion Picture or Video Tape with International or National Availability

Smith, J. D. (Producer), & Smithee, A. F. (Director). (2001). Really big disaster movie [Motion picture]. United States: Paramount Pictures.



A Motion Picture or Video Tape with Limited Availability

Harris, M. (Producer), & Turley, M. J. (Director). (2002). Writing labs: A history [Motion picture]. (Available from Purdue University Pictures, 500 Oval Drive, West Lafayette, IN 47907)



Television Broadcast or Series Episode

Writer, W. W. (Writer), & Director, D. D. (Director). (Date of broadcast or copyright). Title of broadcast [Television broadcast or Television series]. In P. Producer (Producer). City, state of origin: Studio or distributor.



Single Episode of a Television Series

Writer, W. W. (Writer), & Director, D. D. (Director). (Date of publication). Title of episode [Television series episode]. In P. Producer (Producer), Series title. City, state of origin: Studio or distributor.

Wendy, S. W. (Writer), & Martian, I. R. (Director). (1986). The rising angel and the falling ape [Television series episode]. In D. Dude (Producer), Creatures and monsters. Los Angeles, CA: Belarus Studios.

Television Broadcast

Important, I. M. (Producer). (1990, November 1). The nightly news hour[Television broadcast]. New York, NY: Central Broadcasting Service.



A Television Series

Bellisario, D. L. (Producer). (1992). Exciting action show [Television series]. Hollywood, CA: American Broadcasting Company.



Music Recording

Songwriter, W. W. (Date of copyright). Title of song [Recorded by artist if different from song writer]. On Title of album [Medium of recording]. Location: Label. (Recording date if different from copyright date).



Taupin, B. (1975). Someone saved my life tonight [Recorded by Elton John]. On Captain fantastic and the brown dirt cowboy [CD]. London, England: Big Pig Music Limited.

The information for this section comes from https://owl.english.purdue.edu/owl/resource/560/11/


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