Chandrasekhar, U., and B. George. “Vitamin A Nutrition Among Children of Selected Urban Slums of Coimbatore and Effect of Interventions”. The Indian Journal of Nutrition and Dietetics, vol. 27, no. 8, Aug. 1990, pp. 229-36, https://informaticsjournals.co.in/index.php/ijnd/article/view/7812.