Uytven, R. van. 1984. “A. Tzonis, Steden in Ontwikkeling 19de-20ste Eeuw. 10de Internationaal Colloqium Spa 2-5 September 1980. Handelingen”. BMGN - Low Countries Historical Review 99 (2): 252-53. https://doi.org/10.18352/bmgn-lchr.2486.