Ruangvutilert , Pornpimol, Vitaya Titapant, and Thaviponk Suvonnakote. 1996. “Trends in Caesarean Section Rate in Siriraj Hospital (1980-1994)”. Thai Journal of Obstetrics and Gynaecology 8 (3). Bangkok, Thailand:211-18. https://he02.tci-thaijo.org/index.php/tjog/article/view/257678.