Tijn, Th. van, and J.J. Wolter. “Woord Vooraf”. BMGN - Low Countries Historical Review 86, no. 1 (January 1, 1971): 3–3. Accessed February 7, 2023. https://bmgn-lchr.nl/article/view/URN%3ANBN%3ANL%3AUI%3A10-1-107755.