Cuthbert, Mike
Cavendish Publishing Limited, 1993
Buku Teks
Shaw, Josephine, author
Macmillan, 1993
Buku Teks
Groves, Peter J., author
Cavendish, 1995
Buku Teks
edited by Robert M. Maclean
[Publisher not identified], [Date of publication not identified]
Buku Teks
Collins, Lawrence, author
Butterworth, 1990
Buku Teks