
Effective Coaching by Myles Downey: Lessons from the Coach's Coach.
The Integral Vision by Ken Wilber: A Very Short Introduction to the Revolutionary Integral Approach to Life, God, the Universe, and Everything.
Core Coaching: Coaching for Great Performance at Work by Sheridan Maguire: A practical guide to executive coaching that provides a useful toolkit of techniques and creative approaches.
Coaching for Performance: Growing People, Performance and Purpose by John Whitmore: The principles and practice of coaching and leadership.
The Inner Game of Tennis by Timothy Gallwey: The classic guide to the mental side of peak performance.