de Araújo, P. A. M., & 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), 5–15. https://doi.org/10.29121/granthaalayah.v8.i9.2020.1326