1. Alexander, Samuel (1920). Space, Time, and Deity, Macmillan.
2. Ross, William David (1924). Metaphysics, Book VIII (H).6, 1045a 8-10. Aristotle’s Metaphysics, Clarendon Press.
3. Hett, Walter Stanley (1935). De Anima, I.1, 403a 25. Aristotle. On the Soul. Parva Naturalia on Breath, Harvard University Press.
4. On Emergence and Explanation;Baas;Intellectica. Revue de l’Association pour la Recherche Cognitive,1997
5. Bain, Alexander (1870). Logic. Induction. Part Second, Longmans, Green, Reader & Dyer.