How do I distinguish works by one author with same publication dates?
Place lowercase letters immediately after the year in both in-text citations and reference page entries. The letters should follow the order in which the entries will appear on the reference page (i.e., alphabetized by article title). In-text citations will look like this: (Johnson, 2001a, p. 341) and (Johnson, 2002b, p. 341) while reference page entries will begin like this Johnson, T. R. (2001a). Modalities… Johnson, T. R. (2001b). Roles of… (See p. 221 of the APA Publication Manual.