National Association of Social of social Workers, 1980
Buku Teks
Shaw, Ian
Sage, 2001
Buku Teks
edited by Norman A. Polansky
University of Chicago Press, 1962
Buku Teks
Rubin, Ellen
Brooks/Cole, 1993
Buku Teks
Thyer, Bruce A.
London : Sage Publications, 2001,
Buku Referensi