Siagian, Qania, Darhim Darhim, Dadang Juandi, and Khairunnisa Khairunnisa. “The Effect of Problem-Based Learning (PBL) on Improving Students’ Mathematical Ability: Meta-Analysis”. Jurnal Cendekia : Jurnal Pendidikan Matematika 7, no. 3 (August 7, 2023): 2252-2264. Accessed April 16, 2026. https://j-cup.org/index.php/cendekia/article/view/2166.