Castillo Niama, M. P., S. P. Célleri Quinde, W. G. Rojas Yumisaca, and A. C. Lara Velarde. “Intrinsic Motivation in the Teaching-Learning English Process As a Foreign Language”. Ciencia Digital, Vol. 3, no. 4.2, Dec. 2019, pp. 144-59, doi:10.33262/cienciadigital.v3i4.2.1017.