LIEBNIS, V.; INDRA PERDANA; ELANNERI KARANI. Expediencies of Duolingo in English Language Learning: A Systematic Literature Review. EJI (English Journal of Indragiri): Studies in Education, Literature, and Linguistics, [S. l.], v. 9, n. 2, p. 453–462, 2025. DOI: 10.61672/eji.v9i2.2997. Disponível em: https://ejournal-fkip.unisi.ac.id/eji/article/view/2997. Acesso em: 17 jul. 2025.