Kauper, Paul G., author
Little, Brown, 1966
Buku Teks
Barnes, David W., author
West Publishing , 1992
Buku Teks
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