DEWINNY SEPTALIA DALE; INTAN MAHARANI; HAMIDAH SARI BATUBARA; ANDRIANI. The Effectiveness of The Teenagers’ Friends Website Educational Media to Improve Teenagers’ Knowledge About Free Sex at State Vocational School 8 Pekanbaru. Jurnal Ilmiah Kesehatan Mandira Cendikia, [S. l.], v. 5, n. 2, p. 115–123, 2026. DOI: 10.70570/jikmc.v5i2.2141. Disponível em: https://journal.mandiracendikia.com/index.php/JIK-MC/article/view/2141. Acesso em: 14 jun. 2026.