1. Beetham, David, Sarah Bracking, Iain Kearton and Sturt Weir. 2001. International IDEA Democracy Assessment Handbook. The Hague: Kluwer.
2. Berlin, Isaiah. 1997. Two Concepts of Liberty. In: Isaiah Berlin. The Proper Study of Mankind: An Anthology of Essays. London: Chatto & Windus. 191-242.
3. Bobbio, Noberto. 1990. Liberalism and Democracy. London: Verso.
4. Böckenförde, Ernst-Wolfgang. 1991. Staat, Verfassung, Demokratie. Frankfurt a.M.: Suhrkamp.
5. Bollen, Kenneth. 1993. Liberal Democracy: Validity and Method Factors in Cross-National Measures. In: American Journal of Political Science (37). 1207-1230.