DLOUHÁ, J. Úvodník 2008/III/2. Envigogika, Praha, Czech Republic, v. 3, n. 2, 2008. DOI: 10.14712/18023061.214. Disponível em: https://envigogika.cuni.cz/index.php/Envigogika/article/view/214. Acesso em: 5 čvc. 2022.