Leave the menu, then immediately activate the bookshelf again.
If your book has not yet physically appeared on the shelf, wait at the menu screen where you can loot the bookshelf.
To perform this glitch you must be using Goofy Stance, where your feet face the left side of the screen.
Try this on Easy difficulty because it's much easier and when you come down you don't fall off. Perform an FS 360 pop Shuvit, you MUST do an FS, not just a regular 360 pop shuvit.
You will now have looted the book twice, putting two of them in your inventory. It is especially useful with expensive books such as the Oghma Infinium.