“G.J. Jaspers, De Blokboeken En Incunabelen in Haarlems Libry”. BMGN - Low Countries Historical Review 106, no. 2 (January 1, 1991): 267–268. Accessed July 18, 2024. https://bmgn-lchr.nl/article/view/URN%3ANBN%3ANL%3AUI%3A10-1-103853.