PENINGKATAN HASIL BELAJAR MELALUI MODEL PEMBELAJARAN PROBLEM BASED LEARNING MATA PELAJARAN IPAS KELAS IV DI SD N 4 PULOKULON. Sindoro [Internet]. 2026 Jun. 30 [cited 2026 Oct. 21];18(7). Available from: https://journal.cib.institute/index.php/sindoro/article/view/718