Improving Students’ Opinoning Ability and Learning Outcomes Through Problem-Based Learning in VIII grade. JED (Jurnal Etika Demokrasi), [S. l.], v. 8, n. 4, p. 483–496, 2023. DOI: 10.26618/jed.v8i4.12839. Disponível em: https://journal.unismuh.ac.id/index.php/jed/article/view/12839. Acesso em: 2 sep. 2025.