Chaplin, J. P., author
RajaGrafindo Persada, 2006
Buku Referensi
Corsini, Raymond J., author
Brunner-Routledge, 2002
Buku Teks
Corsini, Raymond J., author
Brunner-Routledge, 2002
Buku Referensi
Sitanggang, A. R. Henry, author
Armico, 1994
Buku Teks
Chaplin, J.P., author
Rajawali, 2011
Buku Referensi