ANALISIS EFEKTIVITAS MODEL PROBLEM BASED LEARNING DALAM MENINGKATKAN HASIL BELAJAR IPAS SISWA KELAS VI UPT SDN 90 SAMPULUNGAN. Sindoro: Cendikia Pendidikan, [S. l.], v. 18, n. 3, p. 491–500, 2026. Disponível em: https://cibjournal.com/index.php/sindoro/article/view/5584. Acesso em: 2 oct. 2026.