American Brain Tumor Association (ABTA) "A Primer on Brain Tumors" - pg.28 (.pdf) "Oligodendrogliomas" - Brochure http://www.abta.org
American Association of Neurological Surgeons "Brain Tumor Facts" (.pdf) http://www.aans.org
Wikipedia http://en.wikipedia.org
The Brain Tumor Society http://www.tbts.org
CyberKnife Society http://www.cksociety.org
National Cancer Institute http://www.cancer.gov