ČINČERA, J. Recommended Objectives for Environmental Education. Envigogika, Praha, Czech Republic, v. 6, n. 2, 2011. DOI: 10.14712/18023061.59. Disponível em: https://www.envigogika.cuni.cz/index.php/Envigogika/article/view/59. Acesso em: 22 sep. 2020.