“Influence Application of Learning Models Problem Based Learning (PBL) Against Results Study Mathematics Student Class VII SMP Negeri 1 Pangkur”, IJSR, vol. 1, no. 3, hlm. 151–160, Okt 2024, Diakses: Agu 31, 2026. Tersedia pada: https://www.penerbitjurnalinternasional.com/index.php/ijsr/article/view/731