How can I delete a book entirely? I don't even want it listed in Purchased Books anymore.

How can I delete a book entirely? I don't even want it listed in Purchased Books collection, but it won't allow me to actually Delete it. I can select it for deletion but when I press Delete nothing happens. It deletes off iTunes on my computer with no problem. All the articles I've found just say it will stay in Purchased in case I want to download it again, but I won't so I want it gone completely.