We recommend the following books:-

Dancing with Horses (Communication by Body Language) - Klaus Ferdinand Hempfling
Concious Business (How to Build Value Through Value) - Fred Kofman
Horse Sense and the Human Heart: (What Horses Can Teach Us About Trust, Bonding, Creativity and Spirituality) - Adele McCormick and Marlena McCormick
The Integral Vision: (A Very Short Introduction to the Revolutionary Integral Approach to Life, God, the Universe, and Everything) - Ken Wilber
Horse Sense for the Leader Within: (An Equine Guided Approach to Self Leadership) - Ariana Strozzi
Adventures In Awareness: (Learning with the Help of Horses) - Barbara Rector