Friedlander, Walter A.
Prentice Hall of India, 1982
Buku Teks
Australian council of social service, 0
Buku Teks
Timms, Rita
Routledge, 1982
Buku Referensi
Young, Pat
Macmillan, 1995
Buku Teks
Schneider, Jo Anne
Columbia University Press, 2006
Buku Teks