Chulnoul, P., M. Therawiwat, N. Imamee, and S. Tansakul. “An Effect of Problem-Based Learning to Prevent Amphetamine Use Among Grade 8 Student, Nakornprathom Province”. Thai Journal of Health Education, vol. 34, no. 1, Feb. 2019, pp. 1-14, https://he01.tci-thaijo.org/index.php/muhed/article/view/173873.