1. I. National Research Council. Recommended Dietary Allowances 8th ed. National Academy of Sciences Washington D. C. 1974.
2. Schmidt A. M. Part 80-Definitions and standards of identity for foods for special dietary uses. Part 125-Label statements concerning dietary properties of food purporting to be or represented for special dietary uses. Fed. Reg. 41: 46156 (1976).
3. Abnormal trace metals in man: Cadmium
4. Essential trace metals in man: Zinc. Relation to environmental cadmium
5. Friberg L. Piscator M. and Nordberg G. Cadmium in the Environment. CRC Press Cleveland 1971.