“ANALISIS EFEKTIVITAS MODEL PROBLEM BASED LEARNING DALAM MENINGKATKAN HASIL BELAJAR IPAS SISWA KELAS VI UPT SDN 90 SAMPULUNGAN”. Sindoro: Cendikia Pendidikan, vol. 18, no. 3, Jan. 2026, pp. 491-00, https://cibjournal.com/index.php/sindoro/article/view/5584.