American Psychological Association. (1996). Psychological methods. American Psychological Association.
Citazione stile Chigago Style (17a edizione)American Psychological Association. Psychological Methods. Washington, DC: American Psychological Association, 1996.
Citatione MLA (9a ed.)American Psychological Association. Psychological Methods. American Psychological Association, 1996.
Attenzione: Queste citazioni potrebbero non essere precise al 100%.