Henderson, Roger C., author
Michie Law , 1996
Buku Teks
Corman, Calvin W., author
Little, Brown, 1983
Buku Teks
Keeton, Page, author
West Pub., 1971
Buku Teks
Lunney, glynn, author
West, 2010
Buku Teks
Dine, Janet, author
Blackstone Press, 1998
Buku Referensi