Thimmayamma, B. V. S., and A. Nadamuni Naidu. “Age Assessment of Rural Pre-School Children by the Use of Local Calendars”. The Indian Journal of Nutrition and Dietetics, vol. 11, no. 5, Sept. 1974, pp. 264-7, https://www.informaticsjournals.com/index.php/ijnd/article/view/10128.