KERSTEN, A. J.H.O. Insinger, De achterkant van de diplomatie. BMGN - Low Countries Historical Review, [S. l.], v. 103, n. 2, p. 305–306, 1988. DOI: 10.18352/bmgn-lchr.2971. Disponível em: https://bmgn-lchr.nl/article/view/URN%3ANBN%3ANL%3AUI%3A10-1-103345. Acesso em: 2 may. 2024.