Songsiripradubboon, S., and N. Govitvattana. “Effectiveness of Oral Health Education Between Dentist and Trained School Health Teacher”. Khon Kaen University Dental Journal, vol. 21, no. 2, Dec. 2018, pp. 154-6, https://he01.tci-thaijo.org/index.php/KDJ/article/view/163685.