“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), hlm. 151–160. Tersedia pada: https://www.penerbitjurnalinternasional.com/index.php/ijsr/article/view/731 (Diakses: 31 Agustus 2026).