Introduction to Moral Reasoning/C.S. Lewis
C. S. Lewis Books with some relativity to morality:
Non-Fiction edit
The Abolition of Man
Mere Christianity
The Problem of Pain
Miracles
Fiction edit
The Screwtape Letters
The Great Divorce
Essays edit
(All Essays can be found in the book Essay Collection and Other Short Pieces not currently published in the United States. Check Amazon.co.uk for availability.)
Why I Am Not a Pacifist (see book The Weight of Glory)
Two Ways With the Self
Evil and God
Good Work and Good Works