A. van den Oord, W.S. Unger (1889-1963). Een eigengereid economisch historicus. BMGN - Low Countries Historical Review, [S. l.], v. 113, n. 3, p. 434–435, 1998. DOI: 10.18352/bmgn-lchr.4786. Disponível em: https://ojstest.minions.amsterdam/article/view/URN%3ANBN%3ANL%3AUI%3A10-1-105503.. Acesso em: 27 nov. 2024.