Discovery Publishing House, 1993
Buku Teks
Vina G. Pendit, author
2012
UI - Tesis (Open)
Ika Novi Haryanti, author
Fakultas Psikologi Universitas Indonesia, 2005
UI - Tesis Membership
Byars, Llyod L., author
Richard D. Irwin, 1984
Buku Teks
Batubara, Marwan, author
[publisher not identified], 2009
Buku Teks