YOBOUÉ KOUADIO MICHEL, AGBA. Constraints on Improving Speaking Skills: A Study of English as a Foreign Language (EFL). American Scientific Research Journal for Engineering, Technology, and Sciences, Jordan, v. 36, n. 1, p. 258–270, 2017. Disponível em: https://www.asrjetsjournal.org/American_Scientific_Journal/article/view/3387. Acesso em: 16 sep. 2025.