Huxham, Mark
Prentice-Hall, 2000
Buku Teks
Chiras, Daniel D., author
The Benyamin/Cumings Publishing Company, 1985
Buku Teks
Anderson, David
South-Western College Publishing, 2000
Buku Teks
Mathur, Kamlesh, author
Prentice-Hall, 1994
Buku Teks
Turner, Mark
Kumarian Press, Inc, 1997
Buku Teks