Enrique Espinoza Freire, Dr. C. Eudaldo Enrique, et al. “Distance Education in Times of COVID-19 at the Technical University of Machala Basic Education Major”. Transformación, vol. 17, no. 2, Jan. 2021, pp. 169-83, https://transformacion.reduc.edu.cu/index.php/transformacion/article/view/71.