- McGinn, Bernard (2014). Thomas Aquinas's Summa theologiae: A Biography. Princeton, NJ: Princeton University Press. ISBN 978-0-691-15426-8.
- Thomas Aquinas (1952), edd. Walter Farrell, OP, and Martin J. Healy, My Way of Life: Pocket Edition of St. Thomas—The Summa Simplified for Everyone, Brooklyn: Confraternity of the Precious Blood.
- Pegues (O.P.), Thomas; Whitacre (O.P.), Ælred (1922). Catechism of the Summa theologica of Saint Thomas Aquinas for the use of the faithful. London: Burns, Oates & Washbourne. p. 344. Archived from the original on November 18, 2018 – via archive.org. (with imprimatur of Edmund Canon Surmont, General of Westminster)
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