Harahap N, Handayani H, Nurdiana. Improving Student Learning Outcomes through Problem Based Learning Model in Islamic Learning at SD Negeri 14 Kotapinang. jppg [Internet]. 2023 Feb. 10 [cited 2026 Jun. 13];1(1):167-75. Available from: https://www.journal.ar-raniry.ac.id/index.php/ppg/article/view/6664