1. Aja, E. ( 2001). Spain: Nation, nationalities, and regions. In J. Loughling (Ed.), Subnational democracy in the European Union (pp. 229-253). New York: Oxford University Press.
2. The Spanish ‘state of autonomies’: Non‐institutional federalism
3. Fennema, M. & Tillie, J. ( 2005). Civic communities and multicultural democracy. In S. Roßteutscher (Ed.), Democracy and the role of association: Political, organizational and social contexts (pp. 219-236). London: Routledge .
4. Fiorina, M.P. ( 1999). Extreme voice: A dark side of civic engagement. In T. Skocpol & M. P. Fiorina (Eds.), Civic engagement in American democracy (pp. 395-425). Washington, DC: Brookings Institution.