Artikel Jurnal
Bernhardt, Roger, author
West Publishing, 1993
Buku Teks
Bradbrook, Adrian J., author
The Law Book Company Limited, 1991
Buku Teks
Megarry, Robert, author
Stevens and Sons, 1975.
Buku Teks
Khublall, N., author
Butterworths, 1996
Buku Teks