McConnochie, Keith
Social Science Press, 1988
Buku Teks
edited by F. S. Stevens
Australia and New Zealand Book, 1974
Buku Teks
Klass, Morton
J.B. Lippincott, 1971.
Buku Teks
Richards, Graham, author
Routledge, 1997
Buku Teks
Yarwood, A.T., author
Methuen, 1982
Buku Teks