Luis Moreno, Ethnoterritorial Concurrence and Imperfect Federalism in Spain Archived 23 December 2009 at the Wayback Machine, Instituto de Estudios Sociales Avanzados (CSIC) Working Paper 93-10, pp. 12.
Luis Moreno: "Ethnoterritorial Concurrence and Imperfect Federalism in Spain" Arquivado 23 de decembro de 2009 en Wayback Machine., Instituto de Estudios Sociales Avanzados (CSIC) Working Paper 93-10, pp. 12.