Burke, Karen C., 1951-
West Publishing, 1996
Buku Teks
Andrews, William D., 1931-
Little, Brown, 1979
Buku Teks
Burke, Karen C., 1951-
West Publishing, 1992
Buku Teks
Hudson, David M.
St. Paul, Minn, 1994
Buku Teks
Gaffney, Dennis J.
McGraw-Hill, 1984
Buku Teks