de Araújo, P. A. M. and Eddine, E. A. C. (2020) “THE REVIEWS OF USERS OF THE DUOLINGO APPLICATION: USABILITY AND OBJECTIVITY IN THE LEARNING PROCESS”, International Journal of Research -GRANTHAALAYAH, 8(9), pp. 5–15. doi: 10.29121/granthaalayah.v8.i9.2020.1326.