1. World Health Organization (1996) Trace elements in human nutrition and health. WHO, Geneva
2. Health and Welfare Canada (1990) Nutrition recommendations: the report of the scientific review committee, 1990. Canadian Government Publishing Centre, Ottawa, ON
3. National Research Council (1989) Recommended dietary allowances, 10th edn. National Academic Press, Washington, DC
4. Health and Welfare Canada (1954) Office of the consolidation of the food and drugs act and of the food and drug regulations, part B. Department of Supply and Services, Ottawa
5. Food and Drugs Act, Section C.01.606.1