New answers tagged itunes-store
It's all detailed in the Apple Support Article: View and remove associated devices in iTunes: When you use certain iTunes Store features on your iPhone, iPad, iPod touch, or computer, your iOS device or computer is automatically associated with your Apple ID in iTunes account settings. and You don't need to associate your devices to buy content, ...
Tap the top left corner of iBooks, hit select, then scroll down to the unwanted book and hit it and click delete.
Top 50 recent answers are included