Roessingh, H.K. “Schatten, Rekenen . En Bewijzen”. BMGN - Low Countries Historical Review 106, no. 4 (January 1, 1991): 659–665. Accessed April 27, 2024. https://bmgn-lchr.nl/article/view/URN%3ANBN%3ANL%3AUI%3A10-1-103923.