Sanrung, S., S. Suthutvoravut, S. Patrachai, and V. Singhakajen. “Factors Associated With Sexual Relationship Among High School Female Students in Nakhonratchasima Province”. Ramathibodi Medical Journal, vol. 33, no. 4, Dec. 2010, pp. 259-67, https://he02.tci-thaijo.org/index.php/ramajournal/article/view/152462.