Nelson, Harold L.
The Foundation Press,Inc., 1973
Buku Teks
Ross, Martin J., author
Prentice-Hall, 1977
Buku Teks
Leege, David C., author
Yayasan obor Indonesia, 2006
Buku Teks
Soderquist, Larry D.
The Michie Company, 1991
Buku Teks
Dye, Thomas R., author
Prentice_Hall, Inc, 1988
Buku Teks