Cordero, Aleska. “La educacíon a Distancia En América Latina (Tomos I Y II). Serie Coloquios”. International Journal of E-Learning & Distance Education Revue Internationale Du E-Learning Et La Formation à Distance, vol. 7, no. 3, Dec. 1992, pp. 183-4, https://ijede.ca/index.php/jde/article/view/520.