Visweswara Rao, K., B. V. S. Thimmayamma, P. Rau, and M. C. Swaminathan. “Validity of Calorie Coefficients for Estimation of Nutrient Intake of Adults”. The Indian Journal of Nutrition and Dietetics, vol. 18, no. 2, Feb. 1981, pp. 56-61, https://informaticsjournals.co.in/index.php/ijnd/article/view/12818.