1. La Rochefoucauld, F. (1967). Maximes, suivés par des Reflexions diverses, du Portrait de la Rochefoucauld par lui-měme et des Remarques de Christine de Suède sur les Maximes, ed. J. Truchet . Paris: Garnier.
2. Hume, David (1978). A Treatise of Human Nature, ed. L. A. Selby-Bigge , rev. P. H. Nidditch . Oxford: Oxford University Press.
3. William of Sherwood (1968). Treatise on Syncategorematic Words, trans. N. Kretzmann . Minneapolis: University of Minnesota Press.
4. Wells, N. J. (1981). ‘Suarez on the Eternal Truths’, The Modern Schoolman. 58:.
5. Vogel, C. J. de (1963). ‘The Concept of Personality in Greek and Christian Thought’, Studies in Philosophy and the History of Philosophy. 2:.