These are a few of my favorite books to use in counseling.
If you are coming in for marriage therapy then I suggest that you purchase John Gottman's book "The Seven Principles for Making Marriage Work" and read the first four chapters and do the first exercise in chapter one. 
If you are coming in because of infidelity then we will work using exercises in "Getting Past the Affair." 
If you find that you don't know what to do with conflict in your relationship then "The High Conflict Couple" has great helps. 
If you are confused why your spouse continues to do something that bothers you then read "Why does he do that?"
If you have an addiction to something then read "The Addiction Recovery Skills Workbook." 
If you have a pornography or sex addiction then let's work on "Facing the Shadow" together. 
If you have a lot of anxiety then let's read "Get out of your mind and into your life" together. 
Trouble getting along with family members, work, church, and friends? Check out Boundaries. 
I use Letting Go to teach about emotions and how to not be overwhelmed by them.