GABRIËLS, A. C.P. Briët, N. Plomp, Liber amicorum jhr. mr. C. C. van Valkenburg. BMGN - Low Countries Historical Review, [S. l.], v. 102, n. 2, p. 272–274, 1987. DOI: 10.18352/bmgn-lchr.2820. Disponível em: https://bmgn-lchr.nl/article/view/URN%3ANBN%3ANL%3AUI%3A10-1-103167. Acesso em: 7 feb. 2023.