Reference Books for Six Sigma Implementation

Hi Pete,
If I were to have one “nuts and bolts” DMAIC reference it would be Implementing Six Sigma by Breyfogle. 
If I were primarily working in a transactional environment it would be Lean Six Sigma for Service by the George Group.
If I were to have one good DFSS reference it would be Design for Six Sigma by Kai Yang et al
If I were to have one good pocket BB reference book it would be the Black Belt Memory Jogger by Goal QPC.
If I were to have one good statistics reference it would be Statistics for Experimenters by George Box et al.
Hope this helps…
Best Regards,
Bob J

Dog Sxxt,
Actually I find it wonderfully insightful as well as down and dirty practical…  You bring up a good point on your references for DOE.
A couple of “soft skills” reference books to also consider…
I like Leading Change by Kotter for a good overall perspective on change management and thoughts on building the right culture and The Wisdom of Teams by Katzenbach et al for team dynamics…
Best Regards,
Bob J