The Heart of Coaching: Using Transformational Coaching to Create a High-Performance Culture
by Thomas G. Crane

An enjoyable and well illustrated guide to effective transformational coaching.

Co-Active Coaching: New Skills for Coaching People Toward Success in Work and Life
by Laura Whitworth et al

Describes the coaching model used by the Coaches Training Institute (CTI). Identifies many of the tools and techniques used by effective coaches.

Executive Coaching with Backbone and Heart: A Systems Approach to Engaging Leaders with Their Challenges
by Mary Beth O'Neill

Sound direction on how to coach top executives using a four phase methodology. An approach that is intelligent, courageous, and caring.

Coaching that Counts: Harnessing the Power of Leadership Coaching to Deliver Strategic Value
by Dianna Anderson and Merrill Anderson

In addition to an insightful developmental coaching model for leaders, the authors describe how to measure the ROI of coaching initiatives.

Coaching for Leadership
Goldsmith, Lyons, & Freas (Eds.)

A compilation of best practices in Executive Coaching.

Coaching: Evoking Excellence in Others
by James Flaherty

Effectively synthesizes the underlying theory of coaching with practical coaching examples. An excellent book for the aspiring coach.