P. Klep, “H. van der Wee, E. Aerts, Debates and controversies in economic history. A-sessions. Proceedings tenth international economic history congress Leuven, August 1990”, BMGN-LCHR, vol. 108, no. 3, pp. 449–450, Jan. 1993, doi: 10.18352/bmgn-lchr.3709.