1. Eley, Geoff. 2002. Forging Democracy. The History of the Left in Europe, 1850–2000. Oxford: Oxford University Press.
2. Fleckenstein, Timo. 2011. Institutions, Ideas, and Learning in Welfare State Change. Labour Market Reforms in Germany. Basingstoke: Palgrave Macmillan.
3. Katz, Richard, and Peter Mair. 1995. Changing Models of Party Organization and Party Democracy: The Emergence of the Cartel Party. Party Politics 1 (1).
4. Michels, Robert. 2001 [1911]. Political Parties. A Sociological Study of the Oligarchical Tendencies of Modern Democracies. Trans. Eden & Cedar Paul. Kitchener, ON: Batoche Books.
5. Powell, Martin, ed. 2008. Modernizing the Welfare State. The Blair Legacy. Bristol: Policy Press.