Puri, R., P. Chawla, and S. Mehta. “Retention of Nutrition and Health Knowledge and Practices-After an In-Service Training Programme”. The Indian Journal of Nutrition and Dietetics, vol. 21, no. 12, Dec. 1984, pp. 437-43, http://informaticsjournals.com/index.php/ijnd/article/view/11068.