Andrews, William D., 1931-, author
Little, Brown, 1969
Buku Teks
Hoffman, William H., author
West Publishing, 1987
Buku Teks
edited by William H. Hoffman
West Publishing, 1988
Buku Teks
Rose, Michael D.
St. Paul Minn, 1988
Buku Teks
Gaa, Charles J.
New York, McGraw-Hill c. 1965,
Buku Teks