The church of St Servatius (Maastricht). Bulletin KNOB, [S. l.], v. 93, n. 6, p. 197–213, 1994. DOI: 10.7480/knob.93.1994.6.454. Disponível em: https://bulletin.knob.nl/index.php/knob/article/view/denHartog197. Acesso em: 21 apr. 2026.