DUKERS, B.; KLÜCK, B. J. Venlo, verrassend middeleeuws. Bulletin KNOB, [S. l.], v. 103, n. 6, p. 215–225, 2004. DOI: 10.7480/knob.103.2004.6.247. Disponível em: https://bulletin.knob.nl/index.php/knob/article/view/Dukers215. Acesso em: 2 mei. 2024.