Hastuti, D. et al. 2019. EFFECTIVENESS OF "PIK-R" PROGRAM AS AN EXTRACURRICULAR FOR HIGH/VOCATIONAL SCHOOL STUDENTS IN PREVENTING NEGATIVE BEHAVIORS OF ADOLESCENTS. Jurnal Cakrawala Pendidikan. 38, 1 (Feb. 2019), 1–15. DOI:https://doi.org/10.21831/cp.v38i1.22283.