2 Ways to Transfer iBooks from iPhone/iPad to Computer without iTunes [iOS 12 Supported]When you connect your iPad to the iTunes software installed on your computer, you can configure it to synchronize and back up its digital content -- including the book files stored in the iBooks app -- to your hard drive. Other e-reading apps like Kindle or Nook instead use iTunes File Sharing, which allows you to individually select and then drag and drop the book files you wish to transfer. You can use these book files to organize your e-library, convert them to other e-book formats or share them with friends. Select your iPad from the list of available devices. Select "Books" on the left, and ensure the "Sync Books" check box is enabled. Place a check mark next to the books you want to transfer. Select "Sync.
iTunes - Transfer PDF from PC to Your iPhone, iPad, iPod's iBooks
How to Export Books from iPhone/iPad to Mac/Windows
Have a lot of Books on iPhone or iPad to export to computer? Learn here how to do it the right way But many times, I download books directly on my iPad or iPhone and read them on it. How do I export these files from Books on the device to PC? The PC to iBook import is as easy as a cinch but exporting takes a little more effort. To export a file from within the depths of Books app, you need a file explorer. Like music, Apple does some encryption to the file names and stores them inside the Books folder.
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Method 2：Unrestrictedly Transfer iBooks Files to PC/Mac with Tenorshare iCareFone