Herpina Martangi Sianturi, et al. “THE PRINCIPAL’S MANAGEMENT IN PREVENTING BULLYING THROUGH THE CHILD-FRIENDLY SCHOOL PROGRAM AT SMP NEGERI 6 SANGATTA UTARA”. International Journal of Social Science, Educational, Economics, Agriculture Research and Technology (IJSET), vol. 5, no. 4, Apr. 2026, pp. 2586-91, https://www.ijset.org/index.php/ijset/article/view/1818.