FLORES-DELGADO, L. D.; OLAVE-MORENO, I.; VILLARREAL-BALLESTEROS, A. C.; CANCINO-RÍOS, C. P. Using Duolingo in the EFL classroom: A Study on Effectiveness and Student Perceptions. CIEX JOURNAL, [S. l.], n. 20, p. 47–58, 2025. Disponível em: https://journal.ciex.edu.mx/index.php/cJ/article/view/197. Acesso em: 25 apr. 2025.