Most helpful Diabetes-related book

I've been reading a lot of diabetes books lately as a source of new information to improve my treatment/quality of life and am curious about books that you have read that have been worthwhile.

At the moment the most helpful book I've read is 'pumping insulin' by John Walsh. It's extremely comprehensive and simple to use. I also liked Bernsteins book 'the complete guide to achieving normal blood sugars'. Even though it's controversial I think he does have some great principals like 'small numbers'. 

I also liked "Think Like a Pancreas" by Gary Scheiner, and "Diabetes Burnout" by William Polonsky