S.WUBBOLTS-DE BOER, S. E. van der Vlist, De Burcht van Leiden. BMGN - Low Countries Historical Review, [S. l.], v. 117, n. 2, p. 204–205, 2002. DOI: 10.18352/bmgn-lchr.5657. Disponível em: https://bmgn-lchr.nl/article/view/URN%3ANBN%3ANL%3AUI%3A10-1-106497. Acesso em: 4 may. 2024.