O`Hagan, Kieran, author
Open University Press, 2006
Buku Teks
Martin A.Finkel, Angelo P.Giardino
Sage Publications, 2001
Buku Teks
Jon R. Conte, editor
Sage Publications, 2002
Buku Teks
Merrell, Kenneth W., author
Routledge, 2007
Buku Teks
Kurnia Widianti, author
Fakultas Psikologi Universitas Indonesia, 2004
UI - Skripsi (Membership)