Foskett, David, author
Thomson Reuters, 2010
Buku Teks
Morley, John Viscount, author
Watts, 1933
Buku Teks
Barrett, Maxwell, author
Blackstone Press Limited, 1998
Buku Referensi
Adams, John, 1938-, author
Butterworth, 1987
Buku Teks
Kutner, Peter B.
Greenwood Press , 1988
Buku Teks