“C.P. Briët, N. Plomp, Liber Amicorum Jhr. Mr. C. C. Van Valkenburg”. BMGN - Low Countries Historical Review 102, no. 2 (January 1, 1987): 272–274. Accessed November 23, 2024. https://ojstest.minions.amsterdam/article/view/URN%3ANBN%3ANL%3AUI%3A10-1-103167.