Hinrichs, Roger A.
Energy : its use and the environment
Thomson, Brooks/Cole, 2006
 Buku Teks SO
Manger, Jason J.
The essential internet information guide
McGraw-Hill, 1995
 Buku Referensi
Every student's guide to the internet
McGraw-Hill , 1996
 Buku Teks SO
Olinsky, Sheryl
Dave sperling's internet guide
Prentice-Hall, 1998
 Buku Teks SO
Nelson, Stephen L.
Field guide to the internet
Elex Media Komputindo , 1996
 Buku Teks SO