ROSS, Beata; STUCKLER, David. Barriers to Learning English as a Foreign Language (EFL) for University Students: A Systematic Review. International Journal of Instruction, [S. l.], v. 18, n. 4, p. 395–420, 2025. Disponível em: https://e-iji.net/ats/index.php/pub/article/view/825. Acesso em: 3 oct. 2025.