Herpina Martangi Sianturi, Widyatmike Gede Mulawarman, Haeruddin, Khusnul Khotimah, Laili Komariyah, and Nurlaili, “THE PRINCIPAL’S MANAGEMENT IN PREVENTING BULLYING THROUGH THE CHILD-FRIENDLY SCHOOL PROGRAM AT SMP NEGERI 6 SANGATTA UTARA”, IJSET, vol. 5, no. 4, pp. 2586–2591, Apr. 2026.