Siregar, Mayshe Baidannur, and Suci Dahlya Narpila. “Influence of Problem-Based Learning Model on Students’ Critical Thinking Ability and Learning Motivation in Mathematics Learning”. Numerical: Jurnal Matematika dan Pendidikan Matematika 7, no. 2 (November 11, 2023): 263–274. Accessed July 6, 2025. https://journal.iaimnumetrolampung.ac.id/index.php/numerical/article/view/3884.