Well any of the Mel Bay books for acoustic are good. The ones I have are specific to classical acoustic but I have played through a few of the others as well. I have most of my books packed away but I will look later tonight and see if any stand out.
Can you read music? Do you want to learn to read music....or just tab's/chords?
That will make a big difference on what book you should get. I recommend taking lessons (if possible) if you want to learn to read music.
Edit: I missed that you said e-books, haha oops. Not really sure to be honest.