Não informado. (1947). Journal of Comparative and Physiological Psychology. American Psychological Association.
Chicago-referens (17:e uppl.)Não informado. Journal of Comparative and Physiological Psychology. Arlington, Va: American Psychological Association, 1947.
MLA-referens (8:e uppl.)Não informado. Journal of Comparative and Physiological Psychology. American Psychological Association, 1947.
Varning: dessa hänvisningar är inte alltid fullständigt riktiga.