Schaber, Gordon D., author
West Publishing, 1990
Buku Teks
Rohwer, Claude D., author
Thomson Reuters, 2010
Buku Teks
Kionka, Edward J., author
Thomson Reuters, 2010
Buku Teks
Duxbury, Robert, author
Sweet and Maxwell, 1997
Buku Teks
Manning, Bayless, author
Foundation Press, 1990
Buku Teks