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How do I cite two or more resources by the same author that were published in the same year in APA style?

Last Updated: Apr 27, 2016  |  942 Views

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To distinguish between works by the same author with the same publication date, use the suffixes a, b, c, etc. after the year (American Psychological Association, 2010, p. 178). This format must also be used in the corresponding references. To determine which resource gets what suffix, order the resources alphabetically by the title of the article (excluding "a" or "the"). The first resource would be (2002a), the second resource would be (2002b), etc. You can append the lowercase letters to n.d. as well: n.d.-a, n.d.-b. In your in-text citations, please make sure that you're using the same lower-case letter as you did in your references. For example, (Royal Roads University, n.d.-a, para. 3) and (Royal Roads University, n.d.-b, para. 2) would correspond to the following references:

Royal Roads University. (n.d.-a). Education & technology. Retrieved from

Royal Roads University. (n.d.-b). Humanitarian studies. Retrieved from

See "How to Cite Multiple Pages From the Same Website" from the APA Style Blog for more information.


American Psychological Association. (2010). Publication manual of the American Psychological Association (6th ed.). Washington, DC: Author. 

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