Thongnopakun, Saowanee, Chatprapa Sirirat, Sawitree Visanuyothin, Mereerat Manwong, and Siwanit Thongkhamdee. 2019. “Self-efficacy and social support to prevent teenage pregnancy in universities, Thailand”. Journal of Public Health and Development 17 (1). Bangkok, Thailand:47-59. https://he01.tci-thaijo.org/index.php/AIHD-MU/article/view/175287.