Recommended Books 

Introductory Texts: 

Mere Christianity, by C.S. Lewis
The Reason for God, by Tim Keller
Letters From A Skeptic, by Gregory Boyd
What Christianity Is All About, by Alan Scholes
Love Your God With All Your Mind, by J.P. Moreland

Intermediate Texts: 

The New Testament Documents: Are They Reliable?, by F.F. Bruce
The Case For Christ, by Lee Strobel
The Case For Faith, by Lee Strobel
The Case For A Creator, by Lee Strobel
The Son Rises, by William Lane Craig
When Skeptics Ask, by Norman Geisler
Why I Am A Christian, by Norman Geisler
Is God Just a Human Invention, by Sean McDowell and Jonathan Morrow

Advanced Texts: 

Scaling the Secular City, by J.P. Moreland
Jesus Under Fire, by J.P. Moreland
The Creator and the Cosmos, by Hugh Ross
Reasonable Faith, by William Lane Craig
Come Let Us Reason, by Copan and Craig
Philosophical Foundations for a Christian Worldview, by Moreland and Craig