Purba, Nildahayani, and Suheri Lubis. 2024. “Efforts to Improve Students’ Learning Outcomes Using the Problem Based Learning Method in Islamic Education at SD Negeri 081228 Sibolga”. KOPELMA: Scientific Journal of Education and Teaching 1 (1):165-71. https://journal.mgedukasia.or.id/index.php/kopelma/article/view/339.