Obregón Mayorga, Ángel P., M. A. Logroño Becerra, and C. E. Rojas Castro. “The Use of Duolingo As a Support Tool in English Language Learning ”. ConcienciaDigital, Vol. 4, no. 1.1, Feb. 2021, pp. 250-66, doi:10.33262/concienciadigital.v4i1.1.1557.