Gurung, Geeta, et al. “Placental Site Trophoblastic Tumor With Perimetrial Invasion and Cesarean Scar Perforation (A Case Report)”. Nepal Journal of Obstetrics and Gynaecology, vol. 3, no. 1, Nov. 2008, pp. 55-57, https://nepjol.info./index.php/NJOG/article/view/1443.