Charoensiri, S., C. Toonsiri, and Y. Leelukkanaveera. “Factors Affecting Sexually Transmitted Infection Preventive Behaviors Among Male Students in Non-Formal Education”. Journal of Phrapokklao Nursing College, Chanthaburi, vol. 30, no. 2, June 2019, pp. 14-25, https://he01.tci-thaijo.org/index.php/pnc/article/view/186009.