OK Claudio, I've deleted the duplicate post for you.
Now, it's been a while since I've played with Bones, but I would imagine that you could achieve the effect you're after something like this:
Start with a small anchor bone in the static part of the book spine (1), then pop two bones along the length of the book spine (2), meeting in the middle. This should provide the pivot point you require. Finally, add a child bone that extends along the book cover that will be used to actually turn the book page (3).
I've attached a simple object and scene file that should demonstrate the principles - it suffers from some rather unsightly deformations that I've not looked into, but the principle is sound enough.
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