Gilb's 1988 Principles of Software Engineering Management is an important step in studying Evo. His 2003 Competitive Engineering presents updated refinements, and the details of Planguage; it is the current basis for studying Evo.
Software Projects: Evolutionary versus Big-bang Delivery, Felix Redmill, John Wiley & Sons, 1997. Redmill learned Evo from Gilb in the 1980s and managed projects with it. This book describes his experience and lessons learned.
Free online articles and draft books by Gilb on Evo subjects are available at his Web site: www.gilb.com.
Useful elaboration and refinements for Evo are also available for download from Niels Malotaux at www.malotaux.nl.
Supporting or related texts that are recommended include:
Software Inspection, by Tom Gilb and Dorothy Graham.
Out of the Crisis, by W. Edwards Deming.
The Deming Management Method, by W. Edwards Deming and Mary Walton.
Quality Is Free: The Art of Making Quality Certain, by Philip Crosby.