Urrego, M. Ángel, and M. Ángel Pardo. “1971 Student Movement in Colombia. The Story Told by Its Protagonists”. Cambios Y Permanencias, vol. 11, no. 1, June 2020, pp. 1314-27, https://revistas.uis.edu.co/index.php/revistacyp/article/view/11124.