DLOUHÁ, J.; HUBA, M. Results of the Best Essay Competition on Sustainable Living - 9th Annual - 2010. Envigogika, Praha, Czech Republic, v. 6, n. 1, 2011. DOI: 10.14712/18023061.167. Disponível em: https://www.envigogika.cuni.cz/index.php/Envigogika/article/view/167. Acesso em: 17 sep. 2021.