Rajkumar, B., N. Kumar, and S. Srinivasan. “Placenta Percreta in Primigravida, an Unsuspected Situation”. International Journal of Reproduction, Contraception, Obstetrics and Gynecology, vol. 3, no. 1, Dec. 2016, pp. 239-41, https://www.ijrcog.org/index.php/ijrcog/article/view/830.