If you want a real good book for stretching, look at The Genius of Flexibility by Bob Cooley, this guy has taught this to many, many pro athletes and teams.
I have had the book for a few years and unfortunately don't use it as much as I should. I do have five discs that are messed up and they want to cut me, but this book and some other things I have discovered have kept me from going under the knife so far and form having any further major bouts with my back.
It has also done away with shoulder pain I was developing, ain't old age great ?