Kossmann-Putto, J.A. “R. Wartena, De Stadsrekeningen Van Zutphen 1364-1445/6”. BMGN - Low Countries Historical Review 93, no. 1 (January 1, 1978): 131–132. Accessed March 28, 2024. https://bmgn-lchr.nl/article/view/URN%3ANBN%3ANL%3AUI%3A10-1-102194.