“A. Tzonis, Steden in Ontwikkeling 19de-20ste Eeuw. 10de Internationaal Colloqium Spa 2-5 September 1980. Handelingen”. BMGN - Low Countries Historical Review 99, no. 2 (January 1, 1984): 252–253. Accessed November 23, 2024. https://ojstest.minions.amsterdam/article/view/URN%3ANBN%3ANL%3AUI%3A10-1-102698.