BALLÉN RODRÍGUEZ, Juan Sebastián. Current challenges to education in times of uncertainty. Revista de Investigaciones UNAD, Colombia,CO, v. 13, n. 1, p. 199–227, 2014. DOI: 10.22490/25391887.1138. Disponível em: https://hemeroteca.unad.edu.co/index.php/revista-de-investigaciones-unad/article/view/1138. Acesso em: 6 nov. 2026.