WARDATUL UYUN, N.; PADLURRAHMAN, P.; KHAIRUL WAZNI , M. The Effects of Problem-Based Learning on Fourth-Grade Students’ Critical Thinking and Speaking Skills in English Instruction. IJE : Interdisciplinary Journal of Education, [S. l.], v. 4, n. 1, p. 38–49, 2026. DOI: 10.61277/ije.v4i1.256. Disponível em: https://skillerindonesia.id/index.php/ije/article/view/256. Acesso em: 20 apr. 2026.