“Analisis Kebutuhan Bahan Ajar Matematika Berbasis Problem Based Learning (PBL) Kelas IV Studi Kasus: SD Muhammadiyah Pataan”, ESEJ, vol. 1, no. 1, Jan. 2025, Accessed: May 14, 2026. [Online]. Available: https://esej.uim-yogya.ac.id/index.php/esej/article/view/4