Pengarang: H. -G. Grigoleit

A. W. Norman & K. Schaefer: Vitamin D – Chemical, Biochemical and Clinical Endocrinology of Calcium Metabolism

A. W. Norman & K. Schaefer: Vitamin D. Chemical, Biochemical and Clinical Update

A. W. Norman & K. Schaefer: Vitamin D. Basic Research and its Clinical Application