“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, vol. 94, no. 2, Jan. 1979, pp. 300-2, https://doi.org/10.18352/bmgn-lchr.2100.