Smith, Peter B., author
Harvester Wheatsheaf, 1993
Buku Teks
Ray, William J., 1945-, author
Sage, 2015
Buku Teks
Fakultas Psikologi Universitas Indonesia, 2001
UI - Skripsi (Membership)
Agus Cremers
Kanisius , 1995
Buku Teks
Ramayulis, author
Kalam Mulia, 2004
Buku Teks