DIEPEN, R.C. van. R. Schuursma, Vergeefs onzijdig. Nederlands neutraliteit 1919-1940. BMGN - Low Countries Historical Review, [S. l.], v. 121, n. 3, p. 561–563, 2006. DOI: 10.18352/bmgn-lchr.6506. Disponível em: https://bmgn-lchr.nl/article/view/URN%3ANBN%3ANL%3AUI%3A10-1-107451.. Acesso em: 27 dec. 2024.