1. Anscombe, Gertrude Elizabeth Margaret (1972). Intention, Basil Blackwell. [2nd ed.].
2. Geach, Mary, and Gormally, Luke (2005). Human Life, Action and Ethics, Imprint Academic. chp. 15.
3. Mulligan, Robert W., McGlynn, James V., and Schmidt, Robert W. (1952–1954). Truth, Regnery.
4. The Fathers of the English Dominican Province (1981). The Summa Theologica of St. Thomas Aquinas, Christian Classics.
5. H. Robb, James (1984). Questions on the Soul, Marquette University Press. Mediaeval Philosophical Texts in Translation.