Berg, R. van den. “C.G.M. Kruining, J.G. Kruisheer, G. Verhoeven, Delft, 15 April 1246”. BMGN - Low Countries Historical Review 113, no. 3 (January 1, 1998): 383–384. Accessed September 27, 2024. https://bmgn-lchr.nl/article/view/URN%3ANBN%3ANL%3AUI%3A10-1-105463.