Baumeister, Roy F., author
Thomson, 2008
Buku Teks
Cantril, Hadley
Rutgers Univ. Press, 1965
Buku Teks
Baumeister, Roy F., author
Wardsword cengage learning, 2011
Buku Teks
Winston, Robert ML
BBC Worldwide Limited, 2004
Multimedia
Winston, Robert ML
BBC Worldwide Limited, 2004
Multimedia