Khornwong, S., and E. Kovavisarach. “Cesarean Section Rate Based on The Robson 10-group Classification at Rajavithi Hospital from 2015-2018”. Thai Journal of Obstetrics and Gynaecology, vol. 29, no. 4, July 2021, pp. 191-7, doi:10.14456/tjog.2021.23.