Talsma, J. “W. Drees, Gespiegeld in De Tijd. De Nagelaten Autobiografie, Drees, J. M., Drees, W. B., Schoorl, E., Ed”. BMGN - Low Countries Historical Review, vol. 116, no. 3, Jan. 2001, pp. 426-7, https://doi.org/10.18352/bmgn-lchr.5550.