Stepan, Alfred (1999) ?Federalism and Democracy: Beyond the U. S. Model?, Journal of Democracy, 10(4), pp. 19-34.
Sartori, Giovanni (1994) Ingeniería constitucional comparada: una investigación de estructuras, incentivos y resultados. México: Fondo de Cultura Económica.
Ridley, F. F. (1975) ?Political institutions. The script not the play?, Political Studies 23(2-3).
R. K. Weaver and Bert A. Rockman (eds): Do Institutions Matter? Government Capabilities in the United States and Abroad. Washington DC: The Brookings Institution.
Goodin, Robert E. and Hans-Dieter Klingemann (eds): New Handbook of Political Science. New York: Oxford University Press.
Peters, Guy B. (1999), Institutional theory in political science : the new institutionalism, London, Continuum.
North, Douglass C. (1990) Institutions, institutional change and economic performance. Cambridge: Cambridge University Press.
Lopes, Fernando Farelo (2004), Os Partidos Políticos. Modelos e Realidades na Europa Ocidental e em Portugal, Oeiras, Celta.
Lopes, Fernando Farelo, e André Freire (2002), Partidos Políticos e Sistemas Eleitorais, Oeiras, Celta.
Linz, Juan e Arturo Valenzuela (1995) ?The Failure of Presidential Democracy? Journal of Latin American Studies, Vol. 27, No. 3 (Oct., 1995), pp. 740-741.
Lijphart, Arend (1999) Patterns of democracy: Government forms and performance in thirty-six countries. New Haven: Yale University Press.
Huntington, Samuel (2006) Political Order in Changing Societies. New Haven: Yale University Press.
Finer, Samuel (2004) A História do Governo I ? Monarquias e Impérios Antigos [The History of Government from the Earliest Times, 1997]. Lisboa: Publicações Europa-América.
Dahl, Robert (1989) Democracy and its Critics. New Haven: Yale University Press.
Cruz, Manuel Braga da (org.) (1998), Sistemas eleitorais: o debate científico, Lisboa, ICS/Imprensa de Ciências Sociais.
Berger, Peter L. (1972) Perspectivas sociológicas. Uma visão humanística, Petrópolis: Editora Vozes Ltda.
:
Secundária
Stepan, Alfred (1999) ?Federalism and Democracy: Beyond the U. S. Model?, Journal of Democracy, 10(4), pp. 19-34.
Sartori, Giovanni (1994) Ingeniería constitucional comparada: una investigación de estructuras, incentivos y resultados. México: Fondo de Cultura Económica.
Ridley, F. F. (1975) ?Political institutions. The script not the play?, Political Studies 23(2-3).
R. K. Weaver and Bert A. Rockman (eds): Do Institutions Matter? Government Capabilities in the United States and Abroad. Washington DC: The Brookings Institution.
Goodin, Robert E. and Hans-Dieter Klingemann (eds): New Handbook of Political Science. New York: Oxford University Press.
Peters, Guy B. (1999), Institutional theory in political science : the new institutionalism, London, Continuum.
North, Douglass C. (1990) Institutions, institutional change and economic performance. Cambridge: Cambridge University Press.
Lopes, Fernando Farelo (2004), Os Partidos Políticos. Modelos e Realidades na Europa Ocidental e em Portugal, Oeiras, Celta.
Lopes, Fernando Farelo, e André Freire (2002), Partidos Políticos e Sistemas Eleitorais, Oeiras, Celta.
Linz, Juan e Arturo Valenzuela (1995) ?The Failure of Presidential Democracy? Journal of Latin American Studies, Vol. 27, No. 3 (Oct., 1995), pp. 740-741.
Lijphart, Arend (1999) Patterns of democracy: Government forms and performance in thirty-six countries. New Haven: Yale University Press.
Huntington, Samuel (2006) Political Order in Changing Societies. New Haven: Yale University Press.
Finer, Samuel (2004) A História do Governo I ? Monarquias e Impérios Antigos [The History of Government from the Earliest Times, 1997]. Lisboa: Publicações Europa-América.
Dahl, Robert (1989) Democracy and its Critics. New Haven: Yale University Press.
Cruz, Manuel Braga da (org.) (1998), Sistemas eleitorais: o debate científico, Lisboa, ICS/Imprensa de Ciências Sociais.
Berger, Peter L. (1972) Perspectivas sociológicas. Uma visão humanística, Petrópolis: Editora Vozes Ltda.
: