Blom, J.C.H. “Buitenlandse Politiek, 1919-1945”. BMGN - Low Countries Historical Review 101, no. 2 (January 1, 1986): 219–223. Accessed December 22, 2024. https://bmgn-lchr.nl/article/view/URN%3ANBN%3ANL%3AUI%3A10-1-102927.