Coopmans, J.P.A. “G.H. Hagelstein, De Parlementaire Commissies”. BMGN - Low Countries Historical Review 110, no. 2 (January 1, 1995): 246–248. Accessed February 7, 2023. https://bmgn-lchr.nl/article/view/URN%3ANBN%3ANL%3AUI%3A10-1-104614.