LUKAS, B. A.; YUNUS, M. M. ESL Teachers’ Challenges in Implementing E-learning during COVID-19. International Journal of Learning, Teaching and Educational Research, [S. l.], v. 20, n. 2, p. 330–348, 2021. Disponível em: https://ijlter.myres.net/index.php/ijlter/article/view/164. Acesso em: 14 may. 2026.