STEMMER, R. Mutually sustainable behavior. Envigogika, Praha, Czech Republic, v. 2, n. 1, 2007. DOI: 10.14712/18023061.374. Disponível em: https://envigogika.czp.cuni.cz/index.php/Envigogika/article/view/374. Acesso em: 18 oct. 2021.