edited by Basiro Davey, Alastair Gray, Clive Seale
Open University Press, 2001
Buku Teks
Charles Webster
Open University Press, 2001
Buku Teks
editor, Jonathan M. Mann
Routledge, 1999
Buku Teks
Leathard, Audrey, author
Chapman & Hall, 1993
Buku Teks
editor, David F. Marks
Sage Publications, 2002
Buku Teks