Here is a book recommended by 
3rd Vice President Cindy Allen: 

I joined the prayer team at church, and I will be honest, it wasn’t because I am the greatest prayer but because I wanted motivation to do better in this area.  The leader of our group bought each member a book by Priscilla Shirer, Fervent: A Woman’s Battle Plan for Serious, Specific, and Strategic Prayer.  This is one of the most exciting books I have read in a while.  It is broken in to 10 strategies to a better prayer life.  Each strategy is combating a device the devil uses to weaken not only our prayer life but our Christian walk.  I have not made it through all the strategies but I am soaking in the ones I have read and trying to apply them to my life.  I think this book would be a great study for any individual or group.  It will be a great addition to this study to view the movie War Room.