Arisani, G. and Wahyuni, S. 2023. The Effectiveness of Peer Group WhatsApp on Adolescent Knowledge and Attitudes about Risky Sexual Behavior. Jurnal Promkes: The Indonesian Journal of Health Promotion and Health Education. 11, 1 (Mar. 2023), 11–18. DOI:https://doi.org/10.20473/jpk.V11.I1.2023.11-18.