BUDIHARTO, B. Peningkatan Hasil Belajar IPS Melalui Model Pembelajaran Problem Based Learning (PBL) pada Siswa Kelas VIII-A SMP Negeri 1 Ajung. Education Journal : Journal Educational Research and Development, [S. l.], v. 5, n. 1, p. 97–110, 2021. DOI: 10.31537/ej.v5i1.424. Disponível em: https://jurnal.unipar.ac.id/index.php/ej/article/view/424. Acesso em: 3 aug. 2025.