1. Smith, Barbaro. et al, 1981 Journal of the National Cancer Institute, 67:495.
  2. New England Journal of Medicine, June 17, 1999 Vol. 340 No. 24 pp 1888 - 1900.
  3. Willard, T (Ph.D). The Wild Rose Scientific Herbal, Wild Rose College of Natural Healing, Calgary: 1991 P.7.
  4. Castleman, Michael. The Healing Herbs Rodale Press, Emmaus, Pennsylvania: 1991 P.37.
  5. Heinerman, J. The Science of Herbal Medicine, Biworld Publishing OREM, Utah: 1979 P.47.
  6. Lewis, W.H. & M.P.F. Medical Botany, John Wiley & Sons Inc., New York: P.98.
  7. Culbreth, D.M.R. Materia Medica and Pharmacology, Eclectic Medical Publications Portland, Oregon: (Repr. 1983) P.154.
  8. Krochmal A&C. A Guide to the Medical Plants of the United States, Quadrangle / The New York Times Book Co., New York: 1973 P. 128.
  9. Willard, ibid P. 6.
  10. Castleman, ibid P. 38.
  11. Kirschner, H. (M.D.). Nature's Healing Grasses, H.C. White Publications Yucaipa, California:1960.
Recommended Reading
Pitcairn, Richard H. Natural Health for Dogs & Cats, Rodale Press. Emmaus, PA: 1982, P.6.  
Martin, Ann. N. Food Pets Die For,"Shocking Facts about Pet Food", New Sage Press. Oregon: 1997.  

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