Zastrow, Charles, author
Buku Teks
Zastrow, Charles, author
Brooks/Cole, 1996
Buku Teks
Keefe, Robert H., author
Springer Publishing Company, 2013
Buku Teks
Thyer, Bruce A.
London : Sage Publications, 2001,
Buku Referensi
editor, Bruce A. Thyer
Sage Publications, 2001
Buku Referensi