The effect of health education via Whatsapp on teenagers' knowledge and attitudes toward premarital sex at High School, Medan
Crossref DOI link: https://doi.org/10.53346/wjast.2025.7.2.0017
Published Online: 2025-05-30
Update policy: https://doi.org/10.53346/zsp.ourcrossmarkpolicy
Leny Suarni,
Sri Wahyuni,
Leli Herawati,
