V. BEAVERSTOCK, Jonathan. German Cities in the World City Network. Raumforschung und Raumordnung | Spatial Research and Planning, DE, v. 69, n. 3, p. 213–217, 2011. DOI: 10.1007/s13147-011-0093-3. Disponível em: https://rur.oekom.de/index.php/rur/article/view/789. Acesso em: 16 may. 2025.