Gurung, G., A. Amatya, N. Thakur, and A. Rana. “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.