Senla , Somkuan. 2020. “Sexual Attitudes Among Students of Secondary Level 1-3 in Educational Opportunity Expansion Schools in Singburi Province, 2018”. Journal of Medical and Public Health Region 4 10 (1). Saraburi,Thailand:56-69. https://he01.tci-thaijo.org/index.php/JMPH4/article/view/248479.