Holick, MF; Deluca, HF; Avioli, LV (1972). «Isolation and identification of 25-hydroxycholecalciferol from human plasma». Archives of Internal Medicine. 129 (1): 56–61. PMID4332591. doi:10.1001/archinte.1972.00320010060005
Bender, David A.; Mayes, Peter A (2006). «Micronutrients: Vitamins & Minerals». In: Victor W. Rodwell; Murray, Robert F.; Harper, Harold W.; Granner, Darryl K.; Mayes, Peter A. Harper's Illustrated Biochemistry. New York: Lange/McGraw-Hill. pp. 492–3. ISBN0-07-146197-3 !CS1 manut: Usa parâmetro editores (link)
Holick, MF; Deluca, HF; Avioli, LV (1972). «Isolation and identification of 25-hydroxycholecalciferol from human plasma». Archives of Internal Medicine. 129 (1): 56–61. PMID4332591. doi:10.1001/archinte.1972.00320010060005