HAYA HARATIKKA; ANITA PURBA. ESP LEARNERS’ PERCEPTIONS ON USING DUOLINGO. Multidiciplinary Output Research For Actual and International Issue (MORFAI), [S. l.], v. 3, n. 4, p. 1001–1008, 2024. DOI: 10.54443/morfai.v3i4.1379. Disponível em: https://radjapublika.com/index.php/MORFAI/article/view/1379. Acesso em: 20 apr. 2025.