West Publishing Company, 1993
Buku Teks
Rodgers, William H., author
[Publisher not identified], 1977
Buku Teks
Bockrath, Joseph T.
McGraw-Hill, 1977
Buku Teks
West Publishing Company, 1996
Buku Teks
Tabb, William Murray, author
Michie, 1992
Buku Teks