KERSTEN, A. E.N. van Kleffens, Belevenissen, I, 1894-1940. BMGN - Low Countries Historical Review, [S. l.], v. 98, n. 2, p. 253–256, 1983. DOI: 10.18352/bmgn-lchr.2405. Disponível em: https://bmgn-lchr.nl/article/view/URN%3ANBN%3ANL%3AUI%3A10-1-102603. Acesso em: 6 feb. 2023.