M.S. Polak, M. Dillo, E.J. Harenberg, F. Ketner, Oorkondenboek van Gelre en Zutphen tot 1326, III. BMGN - Low Countries Historical Review, [S. l.], v. 110, n. 1, p. 89–91, 1995. DOI: 10.18352/bmgn-lchr.3955. Disponível em: https://ojstest.minions.amsterdam/article/view/URN%3ANBN%3ANL%3AUI%3A10-1-104549.. Acesso em: 30 jun. 2024.