Thangwijitra, S., C. Sripramodya, and S. Kanchanawat. “Risk Factors of Birth Asphyxia in Pregnancy 37 Complete Weeks and Over by Apgar Score Less Than 7 at 5 Minutes”. Thai Journal of Obstetrics and Gynaecology, vol. 18, no. 2, May 2012, pp. 54-62, https://he02.tci-thaijo.org/index.php/tjog/article/view/1410.