Hoppenbrouwers, P. “J. Kossmann-Putto, Over Middeleeuwse Geschiedenis. Elf Opstellen”. BMGN - Low Countries Historical Review 126, no. 1 (January 1, 2011): 78–79. Accessed May 7, 2024. https://bmgn-lchr.nl/article/view/URN%3ANBN%3ANL%3AUI%3A10-1-108258.