Devkota, A., S. Adhikari, and B. Neupane. “Prostaglandin Induced Labor a Risk Factor for Cervical Tear”. Nepal Journal of Obstetrics and Gynaecology, vol. 1, no. 2, Dec. 2009, pp. 14-18, https://nepjol.info./index.php/NJOG/article/view/1488.