Suttorp, L.C. “De Crisis in De Rechtse Samenwerking (1925-1926)”. BMGN - Low Countries Historical Review 92, no. 3 (January 1, 1977): 406–437. Accessed April 23, 2024. https://bmgn-lchr.nl/article/view/URN%3ANBN%3ANL%3AUI%3A10-1-102168.