Kesuma EP, Muharmi T. Application of Information Services to Develop Understanding of Students’ Attitudes towards Students’ Free Sex Behavior at Harapan Mekar High School Medan . IJE [Internet]. 2022Nov.14 [cited 2025Jul.6];1(2):60-6. Available from: https://jurnal.larisma.or.id/index.php/IJE/article/view/303