1.Thomas Hobbes, Leviathan, edited by Richard Tuck (Cambridge: Cambridge University Press, 1991).
2.Immanuel Kant, Kant’s Practical Philosophy, edited by Mary Gregor, (Cambridge: Cambridge University Press, 1996).
3.Hegel, Elements of the Philosophy of Right, edited by Allen Wood, (Cambridge: Cambridge University Press 1991).
4.John Rawls, A Theory of Justice, Revised edition, (Cambridge, MA: Harvard University Press, 1999)