Routledge , 1998
Buku Teks
Edwards, David, author
Sage Publication, 2004, 2004
Buku Teks
edited by Diane Elizabeth Waller and Andrea Gilroy
Open University Press, 1992
Buku Referensi
edited Judith Aron Rubin
Bunner-routletge, 2001
Buku Teks
Simon, Rita M.
Routledge, 1997
Buku Teks