“ANALISIS EFEKTIVITAS MODEL PROBLEM BASED LEARNING DALAM MENINGKATKAN HASIL BELAJAR IPAS SISWA KELAS VI UPT SDN 90 SAMPULUNGAN”. Sindoro: Cendikia Pendidikan 18, no. 3 (January 5, 2026): 491–500. Accessed October 2, 2026. https://cibjournal.com/index.php/sindoro/article/view/5584.