1. Aquinas, Thomas. 1967. Summa theologiae (Blackfriars Edition), Vol. 10: Cosmogony, ed. and trans: William. A. Wallace. New York: McGraw-Hill.
2. Aquinas, Thomas. 1987. Faith, reason and theology: Questions I–IV of his commentary on the De Trinitate of Boethius, (trans: Armand Maurer). Toronto: Pontifical Institute of Mediaeval Studies.
3. Aristotle, 1984. Complete works, 2 Vols., ed. Jonathan Barnes. Princeton: Princeton University Press.
4. Augustine, 1958. On Christian doctrine (trans: Robertson, D.W.). Indianapolis: Hackett.
5. Bacon, F. 1609. Historia naturalis et experimentalis ad condendam philosophiam: sive Phenomena Universi. In The Oxford Francis Bacon, Vol. 6: Philosophical studies, ed. G. Rees, c.1611–c.1619. Oxford: Oxford University Press, 1996.