1. American Cancer Society. http://www.cancer.org/altmeth.html.
2. 2BR Cassileth .The Alternative Medicine Handbook: The Complete Reference Guide to Alternative and Complementary Therapies. New York, NY: WW Norton; 1998 .
3. 3JA Duke .The Green Pharmacy. Emmaus, Penn: Rodale Press; 1997 .
4. 4VE Tyler .Herbs of Choice. New York, NY: Pharmaceutical Products Press; 1994 .