1. Leung AY, Foster S. Encyclopedia of Common Natural Ingredients Used in Foods, Drugs, and Cosmetics, 2nd ed. New York: John Wiley & Sons, 1996, 306-8.
2. Castleman M. The Healing Herbs. Emmaus, PA: Rodale Press, 1991, 219-21.
3. Weiss RF. Herbal Medicine. Gothenburg, Sweden: Ab Arcanum, 1988, 238-9.
4. Seaborn CD, Nielsen FH. Silicon: a nutritional beneficence for bones, brains and blood vessels? Nutr Today 1993;28:13-8.
5. Hamon NW, Awang DVC. Horsetail. Canadian Pharm J 1992;September:399-401.
6. Blumenthal M, Busse WR, Goldberg A, et al. (eds). The Complete Commission E Monographs: Therapeutic Guide to Herbal Medicines. Boston, MA: Integrative Medicine Communications, 1998, 150-1.
7. Fabre B, Geay B, Beaufils P. Thiaminase activity in Equisetum arvense and its extracts. Plant Med Phytother 1993;26:190-7.