Sirisakulpaisal, B., S. von Bormann, W. Boonpleng, P. Kerdsuwan, S. Buapud, and W. Somnuekprasert. “Relationship Between Knowledge, Attitude, Perception of Self-Protection Skills and Risk Behavior to Pregnancy of Junior High School Students”. Nursing Science Journal of Thailand, vol. 36, no. 4, Dec. 2018, pp. 77-86, https://he02.tci-thaijo.org/index.php/ns/article/view/176904.