Hi, Samgheb. It largely depends on what you’re looking for. I had the opportunity to study at Perkins School of Theology at Southern Methodist University and I can tell you there is no end to the variety of perspectives and topics you can get in theological literature. For books aimed at a more general audience, I’d recommend anything from C.S. Lewis – “Mere Christianity”, “Miracles”, and “The Great Divorce” are especially well done works. Some of the best, most beautifully written, and interesting books I’ve read recently have been by Rob Bell, who is the author of “Love Wins” and “What We Talk About When We Talk About God”.
For more in-depth stuff, I’d recommend anything by William J. Abraham. He comes from the Methodist tradition and I had the opportunity to study under him at SMU. His work on Canonical Theism is particularly fascinating and very important. I come from the Orthodox tradition, so I’d also recommend the work of Fr. John Behr and Fr. John Romanides – their work on Patristic theology is especially good. Finally, from an Orthodox perspective, I can’t recommend the work of Archbishop Lazar Puhalo enough. While his books are in need of editing, you can find Kindle versions at amazon.com. “The Evidence of Things Not Seen: Orthodox and Modern Physics”, “The Nature of Heaven and Hell According to the Holy Fathers”, and “Freedom to Believe” are all very important works.
Hope this helps!