JANSEN, J. P.J.H. Ubachs, Tweeduizend jaar Maastricht. BMGN - Low Countries Historical Review, [S. l.], v. 108, n. 3, p. 453–454, 1993. DOI: 10.18352/bmgn-lchr.3711. Disponível em: https://bmgn-lchr.nl/article/view/URN%3ANBN%3ANL%3AUI%3A10-1-104262. Acesso em: 7 may. 2024.