Anthony Kenny 
Studies in Ethics and the Philosophy of Religion [PDF ebook] 
The Five Ways: St Thomas Aquinas’ Proofs of God’s Existence

First published in 2003. This is Volume V of nine in the Studies in Ethics and the Philosophy of Religion collection. The Series is meant to provide an opportunity for philosophical discussions of a limited length which pursue in some detail specific topics in ethics or the philosophy of religion, or topics which belong to both fields. A draft of this book was delivered as a lecture course at Oxford over the terms of 1967-8.