1. Camagni, R. (1996). Principes et modèles de l’économie urbaine. Paris: Economica.
2. Camagni, R. (1999). The city as a milieu: Applying GREMI’s approach to urban evolution. Revue d’Economie Régionale et Urbaine (RERU), 3, 591–606.
3. Christaller, W. (1933). Die zentralen Orte in Süddeutschland. Jena, Germany: Gustav Fischer.
4. Dicken, P. (1992). Global Shift, the internationalization of economic activity. New York: The Guilford Press.
5. Doz, Y., Santos, J., & Williamson, P. (2001). From global to metanational: How companies win in the knowledge economy. Boston: Harvard Business School Press.