Ponsa, Angela Carolina, and Tri Linggo Wati. “Problem-Based Learning Model to Increase Self-Efficacy of Grade IV Elementary School Students”. Cokroaminoto Journal of Primary Education 8, no. 2 (June 30, 2025): 833–847. Accessed July 27, 2025. https://e-journal.my.id/cjpe/article/view/6244.