Q: How to delete books from iPhone

Hello Ray_J,

Thanks for using Apple Support Communities.

I understand you'd like to delete books in iBooks on your iPhone.  To delete iBooks please follow through the steps below.

Delete books and audiobooks

Remove books or audiobooks from the iBooks app using the steps below:

1. Tap Select.
2. Tap the books you want to delete. 
3. Tap Delete.
4. Tap Done.

Delete music, movies, apps, and other content from your iPhone, iPad, or iPod touch

Cheers.