KOLNIK, Karmen. Guidance of future geography teachers to active education for sustainable . Journal for Geography, [S. l.], v. 6, n. 2, p. 67–76, 2011. DOI: 10.18690/rg.6.2.3838. Disponível em: https://journals.um.si/index.php/geography/article/view/3838. Acesso em: 6 dec. 2025.