Schwartz, Bernard, author
Little, Brown & Co., 1976
Buku Teks
Nowak, John E., author
Thomson/West, 2010
Buku Teks
American Bar Association
Publications International, 1990
Buku Referensi
Clark, Lawrence S., author
McGraw-Hill, 1988.
Buku Teks
Simpson, Laurence P., author
Alexander Hamilton Institute, 1961
Buku Teks