EFEKTIVITAS MODEL PROBLEM BASED LEARNING TERHADAP PENILAIAN KOGNITIF SUBTEMA KESEIMBANGAN EKOSISTEM KELAS V SD. JS (JURNAL SEKOLAH) [Internet]. 2018 Jun. 5 [cited 2026 Jul. 15];2(1):102-6. Available from: https://jurnal.unimed.ac.id/2012/index.php/js/article/view/9927