HEISSENBERGER, P. Signals of Hope. #schuleverantworten, [S. l.], v. 1, n. 3, p. 113–116, 2021. DOI: 10.53349/sv.2021.i3.a119. Disponível em: https://schule-verantworten.education/journal/index.php/sv/article/view/119. Acesso em: 29 märz. 2024.