Wongwananuruk, T., and M. Rattanachaiyanont. “Entrapment of After-coming Head in Cesarean Breech Delivery of Term Pregnancy: A Case Report”. Siriraj Medical Journal, vol. 60, no. 6, Nov. 2008, pp. 356-9, https://he02.tci-thaijo.org/index.php/sirirajmedj/article/view/246511.