Meadows, A.J., author
Kogan Page, 1982
Buku Referensi
Gordon, Michael, author
Kogan Page, 1984
Buku Referensi
Gordon, Michael, author
Kogan Page, 1986
Buku Referensi
Attwood, Gaynor, author
McGraw-Hill, 1989
Buku Referensi
Gunton, Tony, author
Penguin Books, 1993
Buku Referensi