My favorite is The Meaning of Marriage by Tim Keller. This intellectual presentation on marriage is coupled with practical wisdom from a seasoned pastor, who has lead a church in Manhattan for many years. I have so many great quotes underlined in my Kindle for this book. This is one of the few books I need to read every year.
Another helpful book is Real Marriage: The Truth About Sex, Friendship, and Life Together by Mark and Grace Driscoll. Mark Driscoll has been one of the most popular Christian speakers the last decade, and he and his wife give the gift of transparency to help marriages improve. I don’t agree with every aspect of this book, but I do agree with the majority, and respect the courage it took for this couple to open up their lives to the public. This book can be raw at times, but marriage is such an important subject, it deserves honest communication. Mark Driscoll is a pastor in the Seattle area.