A short treatise written by St. Thomas Aquinas laying out the arguments on the credibility of the Christian faith. This is a translation unavailable for many years in English.
Classical answers for modern questions
Translated by Fr. Peter Damian Fehlner, FI and edited with notes and introduction by James Likoudis
This is an excellent translation with notes on a writing of the Angelic doctor, St. Thomas Aquinas, De rationibus fidei contra Saracenos about 1265 A.D. Muslims have to be approached with arguments solely from reason; rational arguments can only show such truths not to be contrary to reason. Supernatural truths exceed the power of reason to demonstrate.