Gaffney, Dennis J., author
McGraw-Hill, 1982
Buku Teks
Gaffney, Dennis J., author
McGraw-Hill, 1984
Buku Teks
Hudson, David M., author
St. Paul, Minn, 1994
Buku Teks
Burke, Karen C., 1951-, author
West Publishing, 1996
Buku Teks
Andrews, William D., 1931-, author
Little, Brown, 1979
Buku Teks