West, Richard L., author
McGraw-HIll, 2007
Buku Teks
McEvoy, J.P., author
Icon Books UK, 2003
Buku Teks
Stephen Ross, editor
Routledge, 2009
Buku Teks
edited by Simon Malpas, Paul Wake
Routledge, 2006
Buku Teks
Ward, Ian, author
Routledge. Cavendish. Taylor & Francis Group, 2004
Buku Teks