Exploring Six Sigma in Hotels: Can You Recommend Books or Share Insights?

I'm interested in Six Sigma in hotels. Can anyone recommend some books or share some knowledge?

Design for Six Sigma for Service
Does anyone know where to find an e-book titled "Design for Six Sigma for Service" (Six Sigma Operational Methods)?

Thank you very much for your reply. So, as you have seen it, could you recommend this book to me? I mean, is it well-written in comparison to other publications? Do you know of other titles connected with Six Sigma in services? I am carrying out research about Six Sigma, so I need a scientific approach.