Chawanpaiboon, S., and A. Sutantawibul. “Mode of Delivery at Siriraj Hospital: A Ten-Year Review (2001-2010)”. Thai Journal of Obstetrics and Gynaecology, vol. 19, no. 4, May 2012, pp. 181-92, https://he02.tci-thaijo.org/index.php/tjog/article/view/1221.