The Bible(I recommend King James Version although any is good)
Mere Christianity by C.S. Lewis
The Chronicles Of Narnia by C.S. Lewis(All seven)
The Screwtape Letters by C.S. Lewis
Revolution In World Missions by K.P. Yohannan(On the links page there is a link where you can grab a free copy of this book)
This present darkness by Frank E. Peretti and it's sequal Piercing the darkness
The Oath by Frank Peretti
Hangman's Curse and nightmare Academy by Frank Peretti.
Left behind series by Tim Lahaye and Jerry B. Jenkins
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Recommended Bible Reference
Below are some concordnances,commentaries and such that are great for Bible research
Strong's exauhstive concordnance,This concordnance lists EVERY word in the kjv of the bible.I believe they make them for niv and other translations.The one I have also has a Greek and Hebrew dictionary in it.I saw a pocket sized version of this one at barnes and noble for $6.97
Matthew Henry's commentary.They make several versions of this.A friend of mine gave me the one volume version.They also make a six volume set.This commentary is useful to explain verses that you don't understand.The one volume version is avalible in the abridged version or the full version.The only major difference between the two is the abridged version has words ommited(nothing important,just a few notes).