Laksitanon, Ratchanee, Somsak Suthusvoravut, Sanya Patrachai, and Vajira Singhakajen. 2010. “Factors Associated With Sexual Relationship Among High School Female Students in Ratchaburi Province”. Ramathibodi Medical Journal 33 (2):70-78. https://he02.tci-thaijo.org/index.php/ramajournal/article/view/138398.