In the helpful book, Making Sense of the Trinity: Three Crucial Questions
by theologian Millard J. Erickson, the author seeks to help the reader understand the Trinity and why it matters. The "Three Crucial Questions" series is a helpful series and I would recommend many of the other books in the series. The three questions raised here are:1. Is the Doctrine of the Trinity Biblical?
2. Does the Doctrine of the Trinity Make Sense?
3. Does the Doctrine of the Trinity make Any Difference?
In response to each of these question, the author offers biblical, orthodox answers. His discussion on the biblical basis of the Trinity was extremely helpful and made me look again at some of the texts I have overlooked. Similarly, the question of why it matters (question 3) was helpful but could have been better. The doctrine of the Trinity is hugely practical and I find myself explaining most Christian doctrines through the lens of the gospel and the Trinity. Everything makes sense in Christian theology in light of the Trinity.
But overall, I would recommend this book even for those new to such issues. If I were to recommend a book on the Trinity to Christians with little to no theologian experience, knowledge, or background, this would be one of them.
For more:
Reviews - Reviews in Brief - The Trinity
No one has preached to more people than the world renown evangelist Billy Graham. His popularity, respect, integrity, and fan fare had traveled with him throughout the world and he has faithfully proclaimed the gospel to the four corners of the world. Now, at the edge of life, his son and others have gathered together a book of collected quotes from Dr. Graham on virtually every subject. From Abortion to Young People, Franklin Graham and Donna Lee Toney allow Billy Graham to speak in the book 
.
before I got married and greatly enjoyed it and as a pastor, I have found myself recommending the series to several persons who were struggling with pornography, lust, premarital sex, adultery, and other sexual sins. Though I may not like everything in the books, there is no doubt a lot to like about them.
I must admit that I am not a fan of "lets make America a Christian nation again." And I say this as a conservative, Reformed pastor who unashamedly cares most about the gospel of Jesus Christ. I have a deep concern that many fly the flag higher than the cross and that Christianity is a term used to rationalize one's particular politics. Most who mix Scripture with politics do so at the cost of Scripture. If politicians have taught us anything, it is that Scripture can be made to say just about anything. Likewise, Christians are wrong to think that the right President, Congress, or laws could "save" our culture. We who have a Savior - the God-man Jesus Christ - ought to know better. Depraved men and women will by no means save a depraved society. We need the gospel.
and although some of my problems I have with Christians calling on other believers to straighten out of culture by means of the state, I will admit that Swain offers a more credible book than most. Dr. Swain is a scholar in her own right and writes like one. Everything is documented, well-researched, and clearly comes from an educated mind that has studied and thought through these issues. For most of the issues she raises, she is dead on articulating the implications of a Christian worldview.
In a follow up to his 2009 book 
discussing the beliefs and teachings of colleges and universities around the country with emphasis on Christian higher education. The authors provide the reader with a lot of information and statistics and the data gathered is the launching pad for the conclusions the authors make.
One of the big debates among conservative and progressive Christians regards the question of justice and the gospel. Recall if you will the Glenn Beck social justice flap from a few months ago. Beck warned his radio listeners to run from any church whose gospel is nothing more than the liberal social gospel. Jim Wallis was furious and told his readers to boycott Glenn Beck. It all got really ridiculous. So much so that progressives were accusing Beck of hating Jesus. Both sides were clearly speaking past one another.
. In brief, I must say that no other book deals with this issue so thoroughly all the while offering pastoral care and application all without falling for the many traps involved. The problem with this issue is that many see this issue as an either/or. Either I preach Jesus only seeking to save souls or doing justice is the gospel. Both are dangerous in their own right and Keller balances them.
by Clinton E. Arnold 
by John Stott
by Timothy Keller
by Trevin Wax
by Ian Murray
by Gregg Allison
by Brian D. McLaren
by Mark Regnerus and Jeremy Uecker
by Mark R. Levin
by Craig Osten and Alan Sears
by TD Jakes (Yes its on the list thanks to a friend) 