Lalopua SF, Pinoa WS. The Implementation of Problem-Based Learning (PBL) Model to Improve Students’ Learning Outcomes and Critical Thinking Skills in Social Studies-Geography at SMP Negeri 77 Maluku Tengah. Gf [Internet]. 24Apr.2025 [cited 7Jun.2025];4(1):20-5. Available from: https://ojs3.unpatti.ac.id/index.php/jgse/article/view/17957