“G.B. Janssen, J. Van Eck, Düffel. Land Wo Wir Wohnen. De Duffelt. Land Waar Wij Wonen”. BMGN - Low Countries Historical Review 107, no. 2 (January 1, 1992): 344–346. Accessed July 2, 2024. https://ojstest.minions.amsterdam/article/view/URN%3ANBN%3ANL%3AUI%3A10-1-104062.