Krishnamurthy, N., S. Geetha, and R. P. Devadas. “Biological Utilization of β-Carotene from Amaranth and Leaf Protein in Preschool Children”. The Indian Journal of Nutrition and Dietetics, vol. 13, no. 9, Sept. 1976, pp. 293-5, https://informaticsjournals.co.in/index.php/ijnd/article/view/11647.