1. Prevalence of selected chronic conditions, United States, 1979-1981;Collins;Vital Health Statistics.,1986
2. American Migraine Study II NHF Information; National Headache Foundation http://www.headaches.org/consumer/presskit/AMS_2/NHF.htm
3. Migraine Update National Institute of Neurological Disorders and Stroke http://www.ninds.nih.gov/disorders/migraine/migraine.htm
4. Ramadan NM Silberstein SD Freitag FG Gilbert TT Frishberg BM Evidence-based guidelines for migraine headache in the primary care setting: Pharmacologic management for prevention of migraine. 2000 http://www.aan.com/professionals/practice/pdfs/gl0090.pdf
5. American Academy of Family Physicians; American College of Physicians-American Society of Internal Medicine. Pharmacologic management of acute attacks of migraine and prevention of migraine headache;Snow;Ann Intern Med.,2002