Hannes, J. “Wandelen in De Tuin Van Europa”. BMGN - Low Countries Historical Review 106, no. 4 (January 1, 1991): 666–670. Accessed May 3, 2024. https://bmgn-lchr.nl/article/view/URN%3ANBN%3ANL%3AUI%3A10-1-103925.