Singh, N Sanajaoba, N Sharat Singh, and RK Narendra. “Postpartum Amenorrhoea Among Manipuri Women: A Survival Analysis”. Journal of Health, Population and Nutrition 30, no. 1 (July 18, 2012): 93–98. Accessed January 21, 2022. https://www.banglajol.info/index.php/JHPN/article/view/11288.