Pack-Brown, Sherlon P., author
Sage, 2003
Buku Teks
Ivey, Allen E., author
Allyn and Bacon, 1996
Buku Teks
editors, Joseph G. Ponterotto, J. Mannuel Casas, Lisa A. Suzuki, Charlene M. Alexander
Sage Publications, 2001
Buku Referensi
Pedersen, Paul, author
American Association for Counseling and Development, 1988
Buku Teks
Edited by Michele A. Paludi
Prentice-Hall, 2002
Buku Teks SO