Sumber Sekunder
Copleston, Fredrick. 1955. Aquinas. Baltimore: Penguin Books.
Wippel, John. 2006. "The Five Ways," in Aquinas' Summa Theologiae: Critical Essays, ed. Brain Davies. Lanham: Rowman & Littlefield Publishers.
Davies, Brian. 1992. The Thought of Thomas Aquinas. New York: Oxford University Press.
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Valencia, William. 2006. "Divine Simplicity," in The Stanford Encyclopedia of Philosophy (2007 Edition), Edward N. Zalta (ed.).
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