Bots, A.C.A.M. “F. Kalshoven, Over Marxistische Economie in Nederland, 1883-1939”. BMGN - Low Countries Historical Review 110, no. 3 (January 1, 1995): 444–446. Accessed April 25, 2024. https://bmgn-lchr.nl/article/view/URN%3ANBN%3ANL%3AUI%3A10-1-104709.