HUBUNGAN ANTARA PERILAKU BULLYING TERHADAP KEPERCAYAAN DIRI SISWA SISWA KELAS IX.B DI  SMP N 31 BATAM. Liberosis [Internet]. 2025 Sep. 29 [cited 2026 Oct. 2];16(4):1-10. Available from: https://cibjournal.com/index.php/liberosis/article/view/155