Hutabarat M. Efforts to Improve Students’ Learning Outcomes by Using the Problem Based Learning Model in Islamic Education and Character Subjects at SD Negeri 084085 Sibolga. jppg [Internet]. 2023 Jul. 31 [cited 2025 Sep. 13];1(2):60-7. Available from: https://journal.ar-raniry.ac.id/index.php/ppg/article/view/6702