Norman, A. W. (2008). "From vitamin D to hormone D: Fundamentals of the vitamin D endocrine system essential for good health". The American Journal of Clinical Nutrition. 88 (2): 491S –499S. doi:10.1093/ajcn/88.2.491S. PMID18689389.
Dawson-Hughes, Bess; Heaney, Robert P.; Holick, Michael F.; Lips, Paul; Meunier, Pierre J.; Vieth, Reinhold (1 July 2005). "Estimates of optimal vitamin D status". Osteoporosis International. 16 (7): 713–716. doi:10.1007/s00198-005-1867-7. PMID15776217. S2CID5430507.
Norman, A. W. (2008). "From vitamin D to hormone D: Fundamentals of the vitamin D endocrine system essential for good health". The American Journal of Clinical Nutrition. 88 (2): 491S –499S. doi:10.1093/ajcn/88.2.491S. PMID18689389.
Dawson-Hughes, Bess; Heaney, Robert P.; Holick, Michael F.; Lips, Paul; Meunier, Pierre J.; Vieth, Reinhold (1 July 2005). "Estimates of optimal vitamin D status". Osteoporosis International. 16 (7): 713–716. doi:10.1007/s00198-005-1867-7. PMID15776217. S2CID5430507.
Dawson-Hughes, Bess; Heaney, Robert P.; Holick, Michael F.; Lips, Paul; Meunier, Pierre J.; Vieth, Reinhold (1 July 2005). "Estimates of optimal vitamin D status". Osteoporosis International. 16 (7): 713–716. doi:10.1007/s00198-005-1867-7. PMID15776217. S2CID5430507.