Proctor, Tony
Routledge, Taylor & Francis Group, 1999
Buku Teks
Yasminia, author
Fakultas Psikologi Universitas Indonesia, 2006
UI - Tesis (Membership)
edited by Janet Davidson, Robert J. Sternberg
Cambridge university , 2003
Buku Teks
by Arvid R. Eide ... [and others]
McGraw-Hill, 2012
Buku Teks
Haley, Jay
Harper & Row, 1978
Buku Teks