Não informado. (2011). Professional Psychology, Research and Practice. American Psychological Association.
Chicago-Zitierstil (17. Ausg.)Não informado. Professional Psychology, Research and Practice. Arlington, Va: American Psychological Association, 2011.
MLA-Zitierstil (8. Ausg.)Não informado. Professional Psychology, Research and Practice. American Psychological Association, 2011.
Achtung: Diese Zitate sind unter Umständen nicht zu 100% korrekt.