Carlyle, R. W. and Carlyle, A. J. (1928). A History of Medieval Political Theory in the West, Vol. V. Edinburgh: W. Blackwood.
2.
Crowe, M. B. (1974). “St. Thomas and Ulpian's Natural Law”, St. Thomas Aquinas. Toronto: Pontificial Institute of Medieval Studies.
3.
Gough, J. W. (1950): John Locke's Political Philosophy. Oxford: Clarendon Press.
4.
Hanson, N. R. (1958). Patterns of Discovery. Cambridge: Cambridge University Press.
5.
Locke, John (1970). Two Treatises of Government, [ed.] Peter Laslett. Cambridge: Cambridge University Press.
6.
Nozick, Robert (1974). Anarchy, State and Utopia. Oxford: Basil Blackwell.
7.
Puffendorf, Samuel (1717). Of the Law of Nature and Nations, Transl. Basil Kennet, 3rd Edition, IV. London: R. Sare.
8.
Tussman, Joseph (1961). Obligation and the Body Politic. New York: Oxford University Press.
9.
Williams, Bernard (1962). “The Idea of Equality” in P. Laslett and W. G. Runciman [eds.] Philosophy, Politics and Society (2nd series). Oxford: Basil Blackwell.
