Marhadi, Hendri, Sapriya Sapriya, Kama Abdul Hakam, and Dasim Budimansyah. 2023. “The Role of the Problem-Based Learning Approach in Optimizing Student Involvement in the Learning Process”. Cypriot Journal of Educational Sciences 18 (3):544-55. https://doi.org/10.18844/cjes.v18i3.8760.