Angell, David, author
Addison-Wesley, 1995
Buku Teks
Cedeno, Nancy, author
Elex Media Komputindo, 1996
Buku Referensi
Allen, Douglas W.
Elex Media Komputindo, 1998
Buku Referensi
Levine, John R., author
IDG Books, 1994
Buku Teks
edited by David S. Wall
Routledge, 2001
Buku Teks