HERLINA, H. Peningkatan Motivasi Belajar melalui Implementasi Problem Based Learning di Sekolah Dasar. Journal of Education Research, [S. l.], v. 5, n. 1, p. 142–147, 2024. DOI: 10.37985/jer.v5i1.750. Disponível em: https://www.jer.or.id/index.php/jer/article/view/750. Acesso em: 9 jul. 2025.