VAUGHAN, R. D.P. Blok, Algemene geschiedenis der Nederlanden, IV, Middeleeuwen. BMGN - Low Countries Historical Review, [S. l.], v. 97, n. 2, p. 246–248, 1982. DOI: 10.18352/bmgn-lchr.2327. Disponível em: https://bmgn-lchr.nl/article/view/URN%3ANBN%3ANL%3AUI%3A10-1-102523. Acesso em: 29 mar. 2024.