Q: Books not showing up after sync in iBooks (iPad and iPhone 4)

I found the solution. here are the steps.

1. Go in Apps
2. Search iBooks
3. Download
4. go in iBooks
5. It will ask you to sync with itune. Select sync.
6. Click option (Book( which show you in the application. you can see Edit Book Store command button.
7. Select Book and you can find PDFs option. Select that one
8. once you done with this activity you are done.
9. You can see all the PDFs in your ipad/ipod.

The epub book in iBooks disappeared from my daughter's iPod Touch (4th gen.).  I would sync, and iTunes on the computer would show the books were on the device, but then when I went into iBooks on the device, there were no books on the shelf.  This solution worked:  I found the actual book files in the Finder (under music, and then itunes) -- you can find the location using Get Info on the file in iTunes -- and then dragged those files back over the iTunes icon in the dock; then I re-synched; and to my surprise, the books show up again on the device in the iBooks app -- they are there, sitting on the shelf.  It's as if the name had been in iTunes, but the content was missing, and doing this somehow reset the files. Strange.

Books (PDFs) in iTunes/Books on my Macbook Pro won't transfer to my iPad 2.

I've deleted the Books App in both iTunes and iPad, restarted Macbook and iPad, reloaded the PDFs in iTunes, but they just won't show on the iPad.

Everything worked fine till this morning.

After dragging/adding the books to itunes library, do the following

Select all books (by pressing ctrl A or Edit>Select All) under 'Books' in 'LIBRARY' (on the left hand side bar)

Then click Edit>Copy (or press ctrl c)

Go to 'DEVICE' and click on 'book' category under your iphone/ipad device being shown there.

Then click Edit>Paste (or press ctrl v)

Sync.

Books show up in iBooks on the iphone/ipad now.

Had the same problem, did a restore and uninstalled the last program that I installed that affected iTunes, LastFM. Not sure which cured the problem, but it's fixed so I'm happy.

I had the  same problem.

Not need to restart Mac or devide

Check this 

http://apple.stackexchange.com/questions/37704/ibooks-preview-not-working

The Copy/Paste process worked for me -- by changing between manual and automatic sync there was always a particular epub file that was never syncing to the iphone.

Never thought this would work but it did. Actually once you paste it starts syncing instantly.

Check the iBOOKS app. At the top there is a drop-down menu. It should say: All Books.

If PDF's is marked your books want show!

That did the job for me!

I Set up family sharing...but my daughter cant see a book i purchased. Wanted to read it together. Went through all trouble shooting on apple support page with no luck

It is an iCloud problem. In your iMac go to system preferences:

- iCloud

- iCloud drive: open the "options" button

- if iBooks is checked, unchecked it.

- click "done"

Close everything. The open again and check the box of iBooks in iCloud drive options (undo what just done).

Now open iTunes and iBooks and the books, pdf, etc should appear again.