JANČAŘÍKOVÁ, K. Environmental education at lower primary school level. Envigogika, Praha, Czech Republic, v. 4, n. 3, 2009. DOI: 10.14712/18023061.141. Disponível em: https://envigogika.czp.cuni.cz/index.php/Envigogika/article/view/141. Acesso em: 21 oct. 2020.