D.J. Roorda, Rond prins en patriciaat. Verspreide opstellen door D. J. Roorda, A. J. C. M. Gabriëls, e. a., ed. BMGN - Low Countries Historical Review, [S. l.], v. 102, n. 1, p. 59–61, 1987. DOI: 10.18352/bmgn-lchr.2780. Disponível em: https://ojstest.minions.amsterdam/article/view/URN%3ANBN%3ANL%3AUI%3A10-1-103045.. Acesso em: 28 sep. 2024.