Johan Firdaus and Hasan Basri, “Dampak Bullying terhadap Prestasi Belajar Siswa Kelas IX SMP Muhammadiyah 1 Gresik : The Impact of Bullying on the Learning Achievement of Class IX Students at SMP Muhammadiyah 1 Gresik”, iqra, vol. 20, no. 1, pp. 72-75, Jan. 2025.