Hryniewicz, Waclaw
Council for Research in Values and Philosophy, 2007
Buku Teks
Peck, M. Scott (Morgan Scott), 1936-2005, author
Tian xia Wen hua Chu ban, 1995
Buku Teks
Staub, Dick, author
John Wiley & Sons Inc., 2007
Buku Teks
Sidabutar, Fransisca M., author
Fakultas Psikologi Universitas Indonesia, 2008
UI - Skripsi (Open)
Chapman, Gary, author
Moody Publishers, 2005
Buku Teks