“P.W. Klein, G.J. Borger, De Jaren Dertig. Aspecten Van Crisis En Werkloosheid”. BMGN - Low Countries Historical Review 96, no. 1 (January 1, 1981): 121–122. Accessed October 11, 2024. https://ojstest.minions.amsterdam/article/view/URN%3ANBN%3ANL%3AUI%3A10-1-102415.