Manalu, Selly, and Bernard Napitupulu. “PENERAPAN PERATURAN DAN PROSEDUR KELAS SEBAGAI UPAYA MENGEMBANGKAN SIKAP DISIPLIN SISWA KELAS IX DALAM PEMBELAJARAN [THE IMPLEMENTATION OF CLASS RULES AND PROCEDURES AS AN EFFORT TO DEVELOP THE DISCIPLINE ATTITUDE OF CLASS IX STUDENTS IN LEARNING]”. Kumpulan Artikel Ilmiah Rumpun Ekonomi dan Ilmu Sosial 4, no. 1 (February 1, 2024): 57–76. Accessed January 30, 2026. https://ojs.uph.edu/index.php/KAIROS/article/view/7901.