You can burn a data CD or DVD with any audio books or spoken word content in your iTunes library. You might want to do this to make a backup copy (or archive) of all your audio files, or to transfer them to another computer.

To burn a DVD, your computer should have an internal SuperDrive and Mac OS 10.2.4 or later. Some third-party DVD burners may also work. You can store about 650 MB of files on a CD, and about 4.7 GB on a DVD.
To burn a data CD or DVD

1. Open iTunes.
2. From the iTunes menu, choose Preferences (Windows: From the Edit menu, choose Preferences).
3. Click the Burning button.
4. Choose Data CD or DVD as the Disc Format.
5. Click OK.
6. Create a playlist that includes all the items in your library (see steps above), or all the items you want to back up to the CD or DVD.
7. Select the playlist you want to burn to the CD or DVD, then click the Burn Disc button.
8. Insert a blank CD-R, CD-RW, DVD-R, or DVD-RW disc, and click Burn Disc again.

Any audio files in the playlist (MP3, AAC, AIFF, WAV, Audible) are copied to the CD or DVD.

If you still can't get it then try DRM free audio books.