DLOUHÁ, J. Competences in environmental education. Envigogika, Praha, Czech Republic, v. 4, n. 1, 2009. DOI: 10.14712/18023061.34. Disponível em: https://envigogika.czp.cuni.cz/index.php/Envigogika/article/view/34. Acesso em: 26 oct. 2020.