Poedjiningsih, Endang, Bastaman Basuki, and A. W. Supardi. “Some Medical and Other Risk Factors for Current Cesarean Section in a Jakarta Hospital”. Medical Journal of Indonesia 10, no. 4 (November 1, 2001): 230-4. Accessed June 23, 2021. http://mji.ui.ac.id/journal/index.php/mji/article/view/39.