Blackstone Press Limited, 1996
Buku Teks
James, Vincent
Rockport Publishers, 1999
Buku Teks
edited, Catherine S. Chilman
Sage Publications, 1988
Buku Teks
Athens, Lonnie H
Routledge, 1989
Buku Teks
Cox, Alwyn
Dian Rakyat, [date of publication not identified]
Buku Teks