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
Andi Mappiare A.T., author
RajaGrafindo Persada, 2004
Buku Teks
Corey, Gerald, author
Brooks/Cole , 2001
Buku Teks