PANHUYSEN, T. A. De Sint-Servaaskerk te Maastricht in de vroege middeleeuwen. Bulletin KNOB, [S. l.], v. 90, n. 1, p. 15–24, 1991. DOI: 10.7480/knob.90.1991.1.485. Disponível em: https://bulletin.knob.nl/index.php/knob/article/view/Panhuysen15. Acesso em: 23 nov. 2024.