Hayati, Nina, Mulyono Mulyono, Edy Surya, and Happy Lumbantobing. “Analyzing Mathematical Problem Solving and Critical Thinking Abilities Through Problem Based Learning at Junior High School Students”. Jurnal Perspektif 9, no. 2 (May 26, 2025): 283–293. Accessed June 19, 2025. https://perspektif.uinsgd.ac.id/index.php/JP/article/view/361.