1. Aquinas T (2012) Commentary on the Letter of Saint Paul to the Romans. Lander, WY: The Aquinas Institute for the Study of Sacred Doctrine.
2. Aquinas T (1948) Summa Theologica. Allen, TX: Christian Classics.
3. Aquinas T (1974) Summa Theologiae, vol. 31, Faith, trans. T. C. O’Brien. (London: Eyre and Spottiswoode.
4. Braaten CE and Jenson RW, eds (1998) Union with Christ: The New Finnish Interpretation of Luther. Grand Rapids: Eerdmans.
5. Calvin J (1957) Institutes of the Christian Religion, trans. Henry Beveridge. Grand Rapids: Eerdmans.