Q: deleting a purchased book

Hello Idacombe,

If I understand correctly you want to delete an iBook you have downloaded to your computer. These steps will help you do that:

How to delete content you've downloaded from the iTunes Store, App Store, iBooks Store, or Mac App Store

Mac or PC

 

If you're using OS X Mavericks or later, you can delete books from iBooks:

1. Open iBooks.
2. Click the book you want to delete.
3. Press Delete on your keyboard.

If you're using an earlier version of OS X, you can delete books from iTunes:

1. Open iTunes.
2. From the Library pop-up menu, choose Books.
3. Click Books in the navigation bar.
4. Click the book you want to delete.
5. Press Delete on your keyboard.

Thank you for using Apple Support Communities.

All the very best,

Sterling