W. Drees, Gespiegeld in de tijd. De nagelaten autobiografie, Drees, J. M., Drees, W. B., Schoorl, E., ed. BMGN - Low Countries Historical Review, [S. l.], v. 116, n. 3, p. 426–427, 2001. DOI: 10.18352/bmgn-lchr.5550. Disponível em: https://ojstest.minions.amsterdam/article/view/URN%3ANBN%3ANL%3AUI%3A10-1-106371.. Acesso em: 22 nov. 2024.