Iwan, Sutiman Bambang Sumitro, Ibrohim, and Fatchur Rohman. “The Effectiveness of the Problem-Based Learning Model to Enhance Students’ Critical Thinking Skills on Conservation Biology Courses”. Jurnal Penelitian Pendidikan IPA 10, no. 8 (August 25, 2024): 4641–4649. Accessed September 6, 2024. https://jppipa.unram.ac.id/index.php/jppipa/article/view/6959.