Bosscher, D.F.J. “H. Langeveld, Schipper Naast God. Hendrikus Colijn 1869-1944, II, 1933-1944”. BMGN - Low Countries Historical Review 120, no. 1 (January 1, 2005): 157–159. Accessed May 4, 2024. https://bmgn-lchr.nl/article/view/URN%3ANBN%3ANL%3AUI%3A10-1-107092.