Visweswara Rao, K., B. V. S. Thimmayamma, and B. Belavady. “Relative Importance of Factors Associated With Duration of Lactation in Mothers of Better Socioeconomic Status”. The Indian Journal of Nutrition and Dietetics, vol. 25, no. 1, Jan. 1988, pp. 7-17, https://www.informaticsjournals.com/index.php/ijnd/article/view/13651.