Greenwood Press, 1986
Buku Referensi
Sage, Lorna
Cambridge Univesity Press, 1999
Buku Referensi
London, Routledge
Buku Referensi
edited by Langdon Lynne Faust
Ungar, 1988
Buku Referensi
Davis, Gwenn
London : Mansell Publishing Limited, 1991,
Buku Referensi