1. Mossner, Ernest Campbell. 1948. Hume’s Early Memoranda, 1729–1740: The Complete Text. Journal of the History of Ideas 9 (4): 492–518.
2. Hobbes, Thomas. 2008. Leviathan. Edited with an introduction by J.C.A. Gaskin. Oxford: Oxford University Press.
3. Kant, Immanuel. 2009. Religion Within the Bounds of Bare Reason. Trans. W.S. Pluhar and Ed. S.R. Palmquist. Indianapolis and Cambridge: Hackett Publishing Company.
4. Locke, John. 2010. A Letter Concerning Toleration and Other Writings. Edited and with an introduction by M. Goldie. Indianapolis: Liberty Fund.
5. Robertson, William. 1794. A Historical Disquisition Concerning the Knowledge Which the Ancients Had of India. 2nd ed. London. A. Strahan and T. Cadell.