Samosir BS, Lubis JS. UPAYA MENINGKATKAN MINAT BELAJAR SISWA MELALUI PENDEKATAN COLLABORATIVE PROBLEM. Ed-Humanistics [Internet]. 2019 Apr. 7 [cited 2024 Apr. 29];4(1). Available from: https://ejournal.unhasy.ac.id/index.php/ed-humanistics/article/view/344