ČINČERA, J. Learning in a Changing World. Envigogika, Praha, Czech Republic, v. 2, n. 2, 2007. DOI: 10.14712/18023061.200. Disponível em: https://www.envigogika.cuni.cz/index.php/Envigogika/article/view/200. Acesso em: 22 sep. 2020.