The guy in the university gave me the book, but i have no room in my inventary and i never got it, when i talk to him i say that i already have it. How can i get the book? Thanks
Look on the ground where you were standing. It is probably lying there, or maybe one of your followers picked it up.
Or the libarian picked the book up. In that case, you may need to steal it back (and may need a Fate point here) or kill her for it.