Chaiyasong , C., P. Tiyapak, S. Supathaweewat, S. Mithala, and S. Chaiyasong. “Effect of Rational Drug Use Policy on Antibiotic Prophylaxis Use in Normal Vaginal Delivery in Mahasarakham Hospital”. Journal of Health Systems Research, vol. 13, no. 3, Sept. 2019, pp. 261-70, https://he04.tci-thaijo.org/index.php/j_hsr/article/view/3692.