“Influence Application of Learning Models Problem Based Learning (PBL) Against Results Study Mathematics Student Class VII SMP Negeri 1 Pangkur” (2024) International Journal of Sustainability in Research (IJSR), 1(3), pp. 151–160. Available at: https://penerbitjurnalinternasional.com/index.php/ijsr/article/view/731 (Accessed: 29 March 2026).