Gehart, Diane R, author
Brooks/Cole Cengage Learning, 2013
Buku Teks
Corey, Gerald, author
Brooks/Cole , 2013
Buku Teks
Nelson-Jones, Richard, author
Thousand Oaks, California: SAGE, 2014
Buku Teks
Herr, Edwin L.
American counseling Association, 1998
Buku Teks
Lapworth, Phil, author
Sage Publications, 2004
Buku Teks