Isnaini R. Pengembangan Buku Konsep Matematika Dengan Model Pembelajaran Problem Based Learning (PBL) Pada Materi Perbandingan. JPION [Internet]. 2025 Dec. 30 [cited 2026 May 12];4(4):2921-30. Available from: https://jpion.org/index.php/jpi/article/view/865