GUSMAN, H. B. .; RACHMAWATI, R. C.; ULFAH, M.; PRIYATNA, R. E. The effectiveness of Problem-Based Learning (PBL) model in increasing students’ cognitive outcomes and learning motivation in Environmental Change Material. Jurnal Mangifera Edu, [S. l.], v. 8, n. 1, p. 32–39, 2023. DOI: 10.31943/mangiferaedu.v8i1.172. Disponível em: https://jurnal.biounwir.ac.id/article/view/172. Acesso em: 17 mar. 2026.