Macmillan Company of Australia, 1989
Buku Teks
Weis, Gregory L, author
Prentice Hall, 1996
Buku Teks
MacMillan Education Australia, 1995
Buku Teks
edited by Jonathan Gabe, Michael Calnan and Michael Bury
Routledge , 1991
Buku Teks
Helman, Cesil G., 1944-, author
Boston Wright, 1990
Buku Teks