Bateman, Anthony, author
Brunner-Routledge, 2003
Buku Teks
Singer, Erwin
Random House, 1965
Buku Teks
Wolberg, Lewis R.
Grune & Stratton, 1965
Buku Teks
Neufeldt, Susan Allstetter
American Counseling Association, 1999
Buku Teks
Brent D. Slife, Richard N. Williams, and Sally H. Barlow
Sage, 2001
Buku Teks