Corsini, Raymond J.
Brunner-Routledge, 2002
Buku Referensi
Chaplin, J. P.
RajaGrafindo Persada, 2006
Buku Referensi
Sitanggang, A. R. Henry
Armico, 1994
Buku Teks
Indigo Books, 2005
Buku Referensi
edited by Gary R. VandenBos
American Psychologycal Association, 2007
Buku Referensi