Kaewpipob, N., and P. Banchonhattakit. “Effects of Health Literacy and Self-Efficacy Developing Program for Promote Pregnancy Prevention Behavior”. Thai Journal of Health Education, vol. 42, no. 1, May 2019, pp. 56-67, https://he01.tci-thaijo.org/index.php/muhed/article/view/187912.