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2. Perspectives in nutrition;Wardlaw,1996
3. Institute of Medicine. Nutrition during pregnancy: part I, weight gain: part II, nutrient supplements. Report of the Subcommittee on Nutritional Status and Weight Gain During Pregnancy, Subcommittee on Dietary Intake and Nutrient Supplement During Pregnancy, Committee on Nutritional Status During Pregnancy and Lactation, Food and Nutrition Board. Washington, DC: National Academy Press, 1990.
4. Optimal calcium intake;JAMA,1994
5. Food and Nutrition Board: National Academy of Sciences. Dietary reference intakes. Washington, DC: National Academy Press, 1997.