Hengcharoen, Sornruth, and Surasith Chaithongwongwatthana. 2012. “Awareness of Emergency Contraception in Adolescent Mothers”. Thai Journal of Obstetrics and Gynaecology 17 (3). Bangkok, Thailand:175-80. https://he02.tci-thaijo.org/index.php/tjog/article/view/1622.