B. W. Hollis: Assessment of vitamin D nutritional and hormonal status: what to measure and how to do it. In: Cacif Tissue Int. Band58, Nr.1, 1996, S.4–5, doi:10.1007/BF02509538, PMID 8825231.
B. W. Hollis: Assessment of vitamin D nutritional and hormonal status: what to measure and how to do it. In: Cacif Tissue Int. Band58, Nr.1, 1996, S.4–5, doi:10.1007/BF02509538, PMID 8825231.