Rosenberg, Nathan, author
Cambridge University Press, 1976
Buku Teks
Cuff, E.C., author
Routledge, 1995
Buku Teks
edited by E.C. Cuff; G.C.F. Payne
George Allen and Unwin, 1984
Buku Teks
edited by Kenneth Thomson and Jeremy Tunstall
Penguin Books, 1983
Buku Teks
edited by S. Venugopal Rao
Vikas Pub. House, 1988
Buku Teks