PENGARUH MODEL PROBLEM BASED LEARNING TERHADAP KEAKTIFAN DAN HASIL BELAJAR SISWA SEKOLAH DASAR . periskop [Internet]. 2024 May 1 [cited 2026 Jul. 19];5(1):1-8. Available from: https://periskop.ipbcirebon.ac.id/index.php/jp/article/view/81