Investigating the Effectiveness of Problem-Based Language Learning for Improving English Spelling of Undergraduate Students. Annual Methodological Archive Research Review, [S. l.], v. 3, n. 7, p. 87–97, 2025. DOI: 10.63075/3y111730. Disponível em: https://www.amresearchjournal.com/index.php/Journal/article/view/430. Acesso em: 13 oct. 2026.