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BOOKS
- Foster, Steven, and James A. Duke. A Field Guide to Medicinal Plants. New York: The Peterson Field Guide Series, Houghton Mifflin Company, 1990.
- Hoffmann, David. The New Holistic Herbal. Massachusetts: Element Books Inc., 1986.
- Kowalchik, Claire, and William H. Hylton, eds. Rodale's Illustrated Encyclopedia of Herbs. Pennsylvania: Rodale Press Inc., 1987.
- McIntyre, Anne. The Medicinal Garden. Henry Holt and Company Inc., 1997.
- Official Proceedings. Medicines from the Earth, Protocols for Botanical Healing. Massachusetts: Gaia Herbal Research Institute, 1996.
- Ondra, Nancy, ed. "200 Herbal Remedies." In The Complete Book of Natural & Medicinal Cures. Pennsylvania: Rodale Press Inc., 1994.
- Weed, Susun S. Wise Woman Ways, Menopausal Years. New York: Ash Tree Publishing, 1992.
PERIODICALS
- Deneen, Sally, and Tracey C. Rembert. "Stalking Medicinal Plants, An International Trade Imperils Wild Herbs." E Magazine (July/Aug. 1999).
OTHER
- Herb World News Online, Research Reviews. 1999. Herb Research Foundation. <http://www.herbs.org>.
- [Article by: Clare Hanrahan]
