Kossmann-Putto, J.A. “Th.A.H. De Nijs, E. Beukers, Geschiedenis Van Holland, I, Tot 1572”. BMGN - Low Countries Historical Review 118, no. 2 (January 1, 2003): 222–223. Accessed April 20, 2024. https://bmgn-lchr.nl/article/view/URN%3ANBN%3ANL%3AUI%3A10-1-106706.