Somer, E., MA, RD. and Health Media of America. (1995). The Essential Guide To
Vitamins and Minerals (2nd ed.). New York: HarperCollins Publishers, Inc.
Murray, M., ND. (1996). Encyclopedia of Nutritional Supplements. California: Prima
Publishing
Duyff, R., MS, RD, CFCS. (1996). The American Dietetic Association's Complete Food
and Nutrition Guide. Minnesota: Chronimed Publishing
Mahan, K, MS, RD, CDE and Escott-Stump, S., MA, RD, LDN. (2000). Krause's Food,
Nutrition, and Diet Therapy (10th ed.). Pennsylvania: W.B. Saunders Company
Dietary Reference Intakes for Calcium, Phosphorus, Magnesium, Vitamin D, and Fluoride,
(1999). National Academy Press
Heimburger, D.C., MD, Weinsier, R., MD. (1997). Handbook of Clinical Nutrition (3rd
ed.). Mosby
MayoClinic Website. (1998). Sodium in soft water
Littlefield, N.A., Hass, B.S. (1996). Is the RDA for Magnesium Too Low? FDA
Science Forum.