Stevens, Ron. “J.W. Brouwer, J.J.M. Ramakers (eds.), Regeren Zonder Rood. Het Kabinet De Quay, 1959-1963”. BMGN - Low Countries Historical Review 124, no. 2 (January 1, 2009): 306–308. Accessed December 22, 2024. https://bmgn-lchr.nl/article/view/URN%3ANBN%3ANL%3AUI%3A10-1-108011.