S. Thangwijitra, 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 J Obstet Gynaecol, vol. 18, no. 2, pp. 54–62, May 2012.