Catholicism

Philip Yancey Recommends: Orthodoxy (Christian Classics)

By K Chesterton, G

Joy to the World: How Christ's Coming Changed Everything (and Still Does)

By Scott Hahn

Introduction to Christianity (Communio Books)

By Joseph Ratzinger

Salvation: What Every Catholic Should Know

By Michael Patrick Barber

The School of Charity: Meditations on the Christian Creed

By Evelyn Underhill (http://evelynunderhill.org/)

The Divine Comedy: Inferno

By Dante Alighieri, Mark Musa

The Great Reformer: Francis and the Making of a Radical Pope

By Austen Ivereigh

Summa of the Summa

By Peter J. Kreeft