Herr, Edwin L.
American counseling Association, 1998
Buku Teks
Lapworth, Phil
Sage Publications, 2004
Buku Teks
Andi Mappiare A.T.
RajaGrafindo Persada, 2004
Buku Teks
Corey, Gerald
Brooks/Cole , 2001
Buku Teks
Andi Mappiare A.T.
Rajawali, 1992
Buku Teks