Best Ruby book for experienced programmer

Victor R. wrote:

however, I am making use of Teach Yourself *Ruby in 21 Days. *This
book
gives you exercises at the end of each chapter.
I make extensive use of the forum by posting my questions and monitoring
others Q&A.

Hi Victor,

This is Regarding:- " Teach Yourself Ruby in 21 Days "

I do not see this book now at any Book Store. Neither is the PDF version
available.

Do you have the pdf version or text version.

Thanks