1. Hegel, G.W. Fredrich. 1956. Lectures on the Philosophy of History. New York: Dover.
2. ———. 1991. Elements of the Philosophy of Right, trans. H.B. Nisbet. Cambridge: Cambridge University Press.
3. Kant, Immanuel. 1996. Practical Philosophy, trans. Mary Gregor. Cambridge: Cambridge University Press.
4. Marx, Karl. 1985. The Communist Manifesto. Harmondsworth: Penguin.
5. Mill, John Stuart. 1963. Collected Works XIII. Toronto and Buffalo: University of Toronto Press.