Callister, William D., Jr., 1940-, author
John Wiley & Sons, 2003
Buku Teks
Askeland, Donald R.
Thomson , 2006
Multimedia
Askeland, Donald R., author
Thomson, 2006
Buku Teks
Prentice-Hall, 1998
Buku Teks
Askeland, Donald R.
Chapman & Hall, 1990
Buku Teks