Kongoun, Watcharaporn, and Somsak Suthutvoravut. “Factors Associated with Sexual Intercourse among Female Teenagers in Ubon Ratchathani Province”. Research Medical Journal 39, no. 3 (September 30, 2016): 187–193. accessed September 20, 2026. https://he02.tci-thaijo.org/index.php/ramajournal/article/view/80213.