“Herman Langeveld, De Man Die in De Put Sprong. Willem Schermerhorn, 1894-1977”. BMGN - Low Countries Historical Review 129, no. 4 (October 8, 2014): review 80. Accessed November 22, 2024. https://ojstest.minions.amsterdam/article/view/URN%3ANBN%3ANL%3AUI%3A10-1-110150.