Carvan, John, author
LBC Information Services Holmes Beach, 1997
Buku Teks
Macleod, John, author
Cavendish Publishing Limited, 2002
Buku Teks
Duxbury, Robert, author
Sweet & Maxwell, 2012
Buku Teks
Jones, Barry
The M E Handbook Series, 1991
Buku Teks
Mustill, Michael J., Sir, author
Steven & Sons, 1981
Buku Teks