MedlinePlus Medical Encyclopedia: US National Library of Medicine; Calcium in diet
Institute of Medicine (US) Standing Committee on the Scientific Evaluation of Dietary Reference Intakes. Dietary Reference Intakes for Calcium, Phosphorus, Magnesium, Vitamin D, and Fluoride. Washington (DC): National Academies Press (US); 1997. 4, Calcium.
National Institutes of Health; Office of Dietary Supplements. [Internet]. U.S. Department of Health & Human Services; Calcium.
National Osteoporosis Foundation I 251 18th St. S, Suite #630 I Arlington, VA 22202 I (800) 231-4222. Calcium/Vitamin D.
MedlinePlus Medical Encyclopedia: US National Library of Medicine; Calcium and bones
Center for Young Women’s Health. Calcium. Boston Children's Hospital [Internet]
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