The Business Case for Design for Six Sigma by Randy Perry and David Bacon (Digital Short Cut); 2007;
www.prenhallprofessional.com/title/0132335093
Six Sigma—The First 90 Days by Stephen Zinkgraf; 2006;
www.prenhallprofessional.com/title/0131687409
Lean Sigma: A Practitioner’s Guide by Ian Wedgewood; 2006;