American Cancer Society

http://www.cancer.org/docroot/home/index.asp?level=0

Inside Cancer

http://www.insidecancer.org/

Cancer Source

http://cancersource.com/

Sloan-Kettering Cancer Information http://www.mskcc.org/mskcc/html/457.cfm

National Cancer Institute http://www.cancer.gov/cancerinfo/wyntk/overview

Virtual Reference Library

http://infotrac.galegroup.com/itweb/k12_gvrl