Dewinny Septalia Dale, Intan Maharani, Hamidah Sari Batubara, and 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, vol. 5, no. 2, Feb. 2026, pp. 115-23, doi:10.70570/jikmc.v5i2.2141.