Affinito, Mona Gustafson
New Harbinger Publications, Inc, 1999
Buku Teks
Hargrave, Terry D., author
Brunner/Mazel, 1994
Buku Teks
Dimas Budi Prasetyo, author
Fakultas Psikologi Universitas Indonesia, 2009
UI - Skripsi (Open)
Enright, Robert D., author
APA LifeTools, 2005
Buku Teks
Christiany, author
2004
UI - Skripsi (Membership)