VEEN, T. B. de Spinoza, F. Akkerman, H.G. Hubbeling, A.G. Westerbrink, Briefwisseling, Akkerman, F., Hubbeling, H. G., Westerbrink, A. G., ed. BMGN - Low Countries Historical Review, [S. l.], v. 94, n. 2, p. 300–302, 1979. DOI: 10.18352/bmgn-lchr.2100. Disponível em: https://bmgn-lchr.nl/article/view/URN%3ANBN%3ANL%3AUI%3A10-1-102276. Acesso em: 29 jan. 2023.