At times, your research may include multiple works by the same author. If the works were published in different years, a standard in-text citation will serve to distinguish them. If you are citing multiple works by the same author published in the same year, include a lowercase letter immediately after the year. Rank the sources in the order they appear in your references section. The source listed first includes an a after the year, the source listed second includes a b, and so on.
Rodriguez (2009a) criticized the nutrition-supplement industry for making unsubstantiated and sometimes misleading claims about the benefits of taking supplements. Additionally, he warned that consumers frequently do not realize the potential harmful effects of some popular supplements (Rodriguez, 2009b).
Tip
If you have not yet created your references section, you may not be sure which source will appear first. See "APA and MLA Documentation and Formatting", "Creating a References Section" for guidelines—or assign each source a temporary code and highlight the in-text citations so you remember to double-check them later on.
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