Nurmala, I., L. A. Salim, M. Muthmainnah, Y. P. Devi, N. Harris, N. Wiseman, and A. Nadia. “Students’ Perception of Their Self-Efficacy by Being a ‘Hey Peer Educator’ in Drug Abuse Prevention”. Jurnal Promkes: The Indonesian Journal of Health Promotion and Health Education, vol. 12, no. 2, Sept. 2024, pp. 180-7, doi:10.20473/jpk.V12.I2.2024.180-187.