Williamson, J. Peter (John Peter), author
Scott, Foresman, 1968
Buku Teks
Andrews, William D., 1931-, author
Aspen Law & Business, 1973
Buku Teks
Andrews, William D., 1931-, author
Little, Brown, 1969
Buku Teks
by Stanley S. Survey ... [and others]
Foundation Press, 1972
Buku Teks
Gaa, Charles J.
New York, McGraw-Hill c. 1965,
Buku Teks