The Essential Enneagram
By David N. Daniels, M.D. and Virginia Price, Ph.D.
Good Overview. If you can only purchase one book on Enneatype, make this the one. No-nonsense and well-researched, The Essential Enneagram provides the most presentable material for a corporate setting. Dr. David Daniels, a Stanford University professor, includes a scientifically developed test based on statistical methods. This book will summarize all the important concepts for you.
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