White, James J., author
West Publishing Company, 1995
Buku Teks
White, James J., author
West Publishing Company, 1988
Buku Teks
Henson, Ray D.
St. Paul Minn, 1979
Buku Teks
Raistrick, Donald
Bowker-Saur, 1995
Buku Teks
West Publishing Company, 1996
Buku Teks