BERG, R. van den. C.G.M. Kruining, J.G. Kruisheer, G. Verhoeven, Delft, 15 april 1246. BMGN - Low Countries Historical Review, [S. l.], v. 113, n. 3, p. 383–384, 1998. DOI: 10.18352/bmgn-lchr.4750. Disponível em: https://bmgn-lchr.nl/article/view/URN%3ANBN%3ANL%3AUI%3A10-1-105463. Acesso em: 7 may. 2024.