- APA Overview
- In-Text Citations
- Reference List
- Other APA Style Issues
- Templates for Writing
Citing Multiple Sources from an Author with the Same Year
You will need to differentiate between sources with the same author and publication date by adding a lower-case letter to the publication year. Including this lower-case letter ensures that the reader knows which source you are citing in-text and can find that source in your reference list.
Add the lowercase letter immediately after the publication year in reference entries:
Centers for Disease Control and Prevention. (2011a). Birth defects. Retrieved April 26, 2011, from http://www.cdc.gov/ncbddd/birthdefects/index.html
Centers for Disease Control and Prevention. (2011b). Calcium and bone health. Retrieved April 26, 2011, from http://www.cdc.gov/nutrition/everyone/basics/vitamins/calcium.html
Centers for Disease Control and Prevention. (2011c). Prevent diabetes. Retrieved April 26, 2011, from http://www.cdc.gov/diabetes/consumer/prevent.htm
*Note that we have listed these entries alphabetically by title, with the lower-case letters assigned based on this order.
Within in-text citations, you will keep the lowercase letter with the publication year:
(Center for Disease Control, 2011a) or According to the Center for Disease Control (2011b)…
APA Style FAQ
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In addition to the information provided here, refer to page 186 in the APA Manual (Sixth Edition) for how to cite and reference nonroutine information and titles.
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You may also find our table on citation variations useful to download and print!