December, John, author
Sams, 1994
Buku Teks
Andrew Herman, Thomas Swiss, editor
Routledge, 2000
Buku Teks
Bradley, Phil, author
Aslib, 2000
Buku Teks
Schneider, Gary P., author
Course Technology Cengage Learning, 2013
Buku Teks
Kent, Peter, author
Prentice Hall of India, 1996
Buku Teks