“R. Schuursma, Vergeefs Onzijdig. Nederlands Neutraliteit 1919-1940”. BMGN - Low Countries Historical Review 121, no. 3 (January 1, 2006): 561–563. Accessed September 17, 2024. https://ojstest.minions.amsterdam/article/view/URN%3ANBN%3ANL%3AUI%3A10-1-107451.