1. Arendt, H. (1973 [1951]). The Origins of Totalitarianism. Orlando, FL: Harcourt, Brace and Company.
2. Arendt, H. (1998 [1958]). The Human Condition. Chicago: University of Chicago Press.
3. Aron, R. (1968 [1957]). The End of the Ideological Age? In C. I. Waxman (Ed.), The End of Ideology Debate (pp. 27–48). New York: Simon & Schuster.
4. Bahro, R. (1982). Socialism and Survival: Articles, Essays and Talks 1979–1982. London: Heretic.
5. Barry, J. (1999). Rethinking Green Politics: Nature, Virtue and Progress. London: Sage.