American Psychological Association. (1996). Psychological methods. American Psychological Association.
Chicago-referens (17:e uppl.)American Psychological Association. Psychological Methods. Washington, DC: American Psychological Association, 1996.
MLA-referens (9:e uppl.)American Psychological Association. Psychological Methods. American Psychological Association, 1996.
Varning: dessa hänvisningar är inte alltid fullständigt riktiga.