Soderquist, Larry D.
The Michie Company, 1991
Buku Teks
West Publishing Co., 1993
Buku Referensi
Glazebrook, P.R., author
Blackstones Press Ltd., 2000
Buku Teks
Chamberlain, Neil W. (Neil Wolverton), author
McGraw-Hill , 1980
Buku Teks
Law Center, 1976
Buku Teks