Barrett, Edward L., author
Foundation Press, 1977
Buku Teks
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
Countryman, Vern, author
Little, Brown, 1971
Buku Teks