Zulfatunisa, Zulfatunisa, Syahriani Sirait, and Rumondang F Manurung. “Implementation of Problem Based Learning (PBL) Learning Model to Improve Learning Outcomes of Class VII Students of SMP Negeri 7 Kisaran”. Holistic Science 4, no. 3 (November 11, 2024): 380–383. Accessed January 21, 2026. https://www.jurnal.larisma.or.id/index.php/HS/article/view/730.