Parvatham, R., and B. Banumathi. “Status of Copper, Zinc and Manganese in Antenatal and Postnatal Women”. The Indian Journal of Nutrition and Dietetics, vol. 36, no. 12, Dec. 1999, pp. 498-04, https://informaticsjournals.co.in/index.php/ijnd/article/view/7045.