Habermas, J. (1975) Legitimation Crisis, Beacon Press, Boston.
Rorty, R. (1984) ‘Habermas and Lotard on postmodernity’, Praxis International, 4, 1, pp. 32–44.
Williamson, T. (1994) Vagueness, Routledge, Abingdon.
Žižek, S. (2008) Violence: Six Sideways Reflections, Profile Books, London.