Putri, Cut Septiya, Anwar, and Usman , trans. “Improving Student Mathematics Understanding through Problem-Based Learning”. International Journal of Scientific Research and Management (IJSRM) 8, no. 06 (June 25, 2020): 1442–1447. Accessed July 1, 2025. https://ijsrm.net/index.php/ijsrm/article/view/2781.