ČINČERA, J.; JOHNSON, B. Earthkeepers in the Czech Republic: Experience from the implementation process of an earth education programme. Envigogika, Praha, Czech Republic, v. 8, n. 4, 2013. DOI: 10.14712/18023061.397. Disponível em: https://envigogika.czp.cuni.cz/index.php/Envigogika/article/view/397. Acesso em: 5 dec. 2021.