“J.H.O. Insinger, De Achterkant Van De Diplomatie”. BMGN - Low Countries Historical Review 103, no. 2 (January 1, 1988): 305–306. Accessed October 17, 2024. https://ojstest.minions.amsterdam/article/view/URN%3ANBN%3ANL%3AUI%3A10-1-103345.