Bibliografia principal:
- Dahl, R. (2015). On Democracy. New Haven: Yale University Press.
- Keane, J. (2022). Breve História da Democracia. Editorial Presença.
- Held, D. (2006). Models of democracy. Cambridge: Polity.
- Cunnigham, F. (2002). Theories of Democracy. London & NY: Routledge.
- Przeworski, A., Stokes, S. C., & Manin, B. (1999). Democracy, accountability, and representation. Cambridge, U.K: Cambridge University Press.
- Pinto, A. C., Sousa, L., & Magalhães,P. C. (2013). A qualidade da democracia em Portugal. Lisboa: Imprensa de Ciências Sociais.
- Levitsky, S.; Ziblatt, D. (2018). Como Morrem as Democracias. Vogais.
- Linz, Juan; Stepan, Alfred (2001). Problems of Democratic Transition and Consolidation. Baltimore: John Hopkins University Press.
- Diamond, L., & Morlino, L. (eds.) (2005). Assessing the quality of democracy. Baltimore: Johns Hopkins University Press.