Tika Bisono
Fakultas Psikologi Universitas Indonesia, 2004
UI - Tesis Membership
edited by William C. Sze and June G. Hopps
Schenkman, 1978
Buku Teks
DePoy, Elizabeth
Brooks/Cole-Thomson Learning, 2003
Buku Teks
Nugent William R.
Thomson Learning, 2001
Buku Teks
Sitepu, Septa Andreas
Fakultas Ekonomi dan Bisnis Universitas Indonesia, 2012
UI - Tesis Open