WITTLICH, Christian; BRÜHNE , Thomas. Operationalisation of ESD Criteria for the Inventory of Out-of-School ESD Learning Places in Rhineland-Palatinate. Journal of Geography Education, [S. l.], v. 50, n. 1, p. 1–19, 2022. DOI: 10.18452/23581. Disponível em: https://zgd-journal.de/index.php/zgd/article/view/47. Acesso em: 2 apr. 2026.