SUTTORP, L. De crisis in de rechtse samenwerking (1925-1926). BMGN - Low Countries Historical Review, [S. l.], v. 92, n. 3, p. 406–437, 1977. DOI: 10.18352/bmgn-lchr.2004. Disponível em: https://bmgn-lchr.nl/article/view/URN%3ANBN%3ANL%3AUI%3A10-1-102168. Acesso em: 22 jan. 2022.