Regarding any books on marriage, the main book that anyone needs to consider is the Bible. It offers us all that we need in all things (2 Tim. 3:16-17). Any other books are only of value to the extent that they direct us to what Scripture says, or relate the efforts of Christians to obey God’s word regarding marriage. It would not be appropriate in this forum to advocate human books, given that all human books are subject to the weaknesses and biases of their authors. However, if you would care to contact me personally we could discuss the merits and weaknesses of some texts that are available. My e-mail is: email@example.com. I would encourage you to keep the Bible as your focus, because it alone will be the standard by which we will be judged on the last day (cf. John 12:47-48).
Kyle Pope, August 2010