Jampolsky, Gerald G., author
Erlangga, 2001
Buku Teks
Dimas Budi Prasetyo, author
Fakultas Psikologi Universitas Indonesia, 2009
UI - Skripsi (Open)
Affinito, Mona Gustafson
New Harbinger Publications, Inc, 1999
Buku Teks
Enright, Robert D., author
APA LifeTools, 2005
Buku Teks
Christiany, author
2004
UI - Skripsi (Membership)