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