Environmental Problem Perception of 6th Grade Students. World Journal of Environmental Research, [S. l.], v. 6, n. 1, p. 25–35, 2016. DOI: 10.18844/wjer.v6i1.139. Disponível em: https://un-pub.eu/ojs/index.php/wjer/article/view/139. Acesso em: 23 dec. 2024.