To distinguish works with the same author or same authors in the same order and the same year of publication, append a lowercase letter to the year in both the reference list entry and in-text citation.
(Publication Manual of the American Psychological Association, 2020, p. 305)
Example:
Jost, J. T., Glaser, J., Kruglanski, A. W., & Sulloway, F. J. (2003a). Political conservatism as motivated social cognition. Psychological Bulletin, 129(3), 339–375. https://doi.org/10.1037/0033-2909.129.3.339
Jost, J. T., Glaser, J., Kruglanski, A. W., & Sulloway, F. J. (2003b). Exceptions that prove the rule: Using a theory of motivated social cognition to account for ideological incongruities and political anomalies: Reply to Greenberg and Jonas (2003). Psychological Bulletin, 129(3), 383–393. https://doi.org/10.1037/0033-2909.129.3.383
Narrative citation: Jost et al. (2003a)
Parenthetical citation: (Jost et al. 2003a)