PREVENIER, W. E.J. Harenberg, Oorkondenboek van Gelre en Zutphen tot 1326, IV. BMGN - Low Countries Historical Review, [S. l.], v. 110, n. 1, p. 91–92, 1995. DOI: 10.18352/bmgn-lchr.3956. Disponível em: https://bmgn-lchr.nl/article/view/URN%3ANBN%3ANL%3AUI%3A10-1-104550. Acesso em: 6 may. 2024.