UYTVEN, R. van. A. Tzonis, Steden in ontwikkeling 19de-20ste eeuw. 10de internationaal colloqium Spa 2-5 september 1980. Handelingen. BMGN - Low Countries Historical Review, [S. l.], v. 99, n. 2, p. 252–253, 1984. DOI: 10.18352/bmgn-lchr.2486. Disponível em: https://bmgn-lchr.nl/article/view/URN%3ANBN%3ANL%3AUI%3A10-1-102698. Acesso em: 28 jan. 2023.