JANSSEN, J.A.M.M. G.B. Janssen, J. van Eck, Düffel. Land wo wir wohnen. De Duffelt. Land waar wij wonen. BMGN - Low Countries Historical Review, [S. l.], v. 107, n. 2, p. 344–346, 1992. DOI: 10.18352/bmgn-lchr.3535. Disponível em: https://bmgn-lchr.nl/article/view/URN%3ANBN%3ANL%3AUI%3A10-1-104062.. Acesso em: 2 dec. 2024.