by Michele Moore [and others]
The Falmer Press, 1996
Buku Teks
Hartley, Hazel J.
Cavendish Publishing Limited, 2001
Buku Teks
Parker, Howard
Routledge, 1998
Buku Teks
edited by Tony Chapman and Jenny Hockey
Routledge, 1999
Buku Teks
Campbell, Don G., 1946-
MAcDonald and Evans , 1978
Buku Teks