SAMOSIR, B. S.; LUBIS, J. S. UPAYA MENINGKATKAN MINAT BELAJAR SISWA MELALUI PENDEKATAN COLLABORATIVE PROBLEM. Ed-Humanistics : Jurnal Ilmu Pendidikan, [S. l.], v. 4, n. 1, 2019. DOI: 10.33752/ed-humanistics.v4i1.344. Disponível em: https://ejournal.unhasy.ac.id/index.php/ed-humanistics/article/view/344. Acesso em: 28 apr. 2024.