Irawati, Tri Novita. “Developing Student Critical Thinking Ability by Using Problem Based Learning (PBL)”. Jurnal Axioma : Jurnal Matematika dan Pembelajaran 3, no. 1 (January 28, 2018): 51–59. Accessed November 22, 2024. https://ejurnal.uij.ac.id/index.php/AXI/article/view/309.