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Aristotle, On the Soul (De Anima), W. S. Hett (trans.), pp. 1–203 in Aristotle, Volume 8, Loeb Classical Library, William Heinemann, London, UK, 1936.

Avicenna, De Anima (Fi’l-Nafs), F. Rahman (trans.), London, UK, 1954.

Tufail, Ibn, The Improvement of Human Reason: Exhibited in the Life of Hai Ebn Yokdhan (Hayy ibn Yaqzan), Simon Ockley (trans.), pp. 1–195, Edm. Powell, London, Great Britain, 1708.

Aquinas, Thomas, Summa Theologica, Fathers of the English Dominican Province (trans.), Daniel J. Sullivan (ed.), vols. 19–20 in Robert Maynard Hutchins (ed.), Great Books of the Western World, Encyclopædia Britannica, Inc., Chicago, IL, 1952.

Locke, John, An Essay Concerning Human Understanding, Kenneth P. Winkler (ed.), pp. xix (Editor's Introduction) and 33–36 (Book II, Chap. I, 1–9), Hackett Publishing Company, Indianapolis, IN, 1996 [1689].