Daud, Siti Arfah, Mohammad Jamhari, and Lilies N. Tangge. “Development of Problem-Based Learning Tools to Improve Critical Thinking Skills and Collaboration Skills of Class VIII Junior School Students”. International Journal of Education, Humaniora, and Social Studies 1, no. 2 (September 30, 2024): 84–93. Accessed June 24, 2026. https://journal.dpipublish.com/index.php/ijehss/article/view/10.