The role and importance of Ielts Tefl Tesol Toefl and other international certificates in foreign countries. Texas Journal of Multidisciplinary Studies, USA, v. 21, p. 44–46, 2023. Disponível em: https://mail.zienjournals.com/index.php/tjm/article/view/4136. Acesso em: 17 may. 2026.