Muliana, Haika, Agus Ramdani, and Kusmiyati Kusmiyati. “Effect of Problem-Based Learning Model on Biology Learning Motivation and Conceptual Understanding”. Jurnal Pijar Mipa 20, no. 5 (August 8, 2025): 958–964. Accessed August 21, 2025. http://jurnalfkip.unram.ac.id/index.php/JPM/article/view/9716.