SANOLL, C. Openluchtscholen in Nederland [Freiluftschulen]. Bulletin KNOB, [S. l.], v. 101, n. 1, p. 16–29, 2002. DOI: 10.7480/knob.101.2002.1.297. Disponível em: https://bulletin.knob.nl/index.php/knob/article/view/497. Acesso em: 11 mei. 2024.