Veen, Th.J. “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 94, no. 2 (January 1, 1979): 300–302. Accessed August 17, 2024. https://bmgn-lchr.nl/article/view/URN%3ANBN%3ANL%3AUI%3A10-1-102276.