Sittiboonma, N., and C. Sota. “The Effect of Health Education Program by Applying Protection Motivation Theory and Social Support Theory for Adolescent Pregnancy Prevention among Muttayomsuksa 5 student in a school, Khon Kaen Province”. Thai Journal of Health Education, vol. 40, no. 1, July 2018, pp. 12-23, https://he01.tci-thaijo.org/index.php/muhed/article/view/135595.