In our experience the following books are the best on Christian life coaching. Links to Amazon.com are provided for each book for more information and purchase.
Christian Coaching: Gives an oaverview of the field of Christian Life Coaching.
Christian Life Coaching Handbook: By one of the top coaches in the U.S
Leadership Coaching: One of the best books on coaching skills.
The Business and Practice of Coaching: How to get started (Secular)
The Call Journey: The map of how God works with people to achieve their calling.
Believe That You Can: Finding your dream and call in God.