Kauper, Paul G., author
Little, Brown, 1971
Buku Teks
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