Premakumari, S., and K. Deepa. “Socio-Economic, Nutritional and Health Factors Influencing the Cognitive Development of 7-9 Year Old Children”. The Indian Journal of Nutrition and Dietetics, vol. 45, no. 1, Jan. 2008, pp. 1-10, https://informaticsjournals.co.in/index.php/ijnd/article/view/4983.