Answered By: Theresa Bell
Last Updated: Dec 20, 2019     Views: 3080

APA 6th Edition

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 http://www.royalroads.ca/prospective-students/programs/education-technology

Royal Roads University. (n.d.-b). Humanitarian studies. Retrieved from http://www.royalroads.ca/prospective-students/programs/humanitarian-studies

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

Reference

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

APA 7th Edition

To distinguish between works by the same author with the same publication date, use the suffixes a, b, c, etc. after the year in both in-text citations and the corresponding references (American Psychological Association [APA], 2020, p. 267). To determine the appropriate suffix for each resource, first look at the dates: "references with only a year precede those with more specific dates, and specific dates are placed in chronological order" (APA, 2020, p. 305). For example, a work published in 2018 would appear in the references before a work published on September 18, 2018. If the works have identical dates, order the resources alphabetically by the title of the resource (excluding "a", "an", or "the" at the start of the title) (APA, 2020, p. 305).

Once the resources are ordered, assign each resource the appropriate suffix following that order. For example, using the examples above the resource published in 2018 would be (2018a) and the resource published on September 18, 2018, would be (2018b). Append the lowercase letters to n.d. as well: n.d.-a, n.d.-b (American Psychological Association, 2020, p. 305). In your in-text citations, please use the same lowercase letter as in the 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 http://www.royalroads.ca/prospective-students/programs/education-technology

Royal Roads University. (n.d.-b). Humanitarian studies. Retrieved from http://www.royalroads.ca/prospective-students/programs/humanitarian-studies

Reference

American Psychological Association. (2020). Publication manual of the American Psychological Association (7th ed.). https://doi.org/10.1037/0000165-000