If you wish to earn bitcoins by reading books you can join paid books. Paid books pay bitcoins for reading a page for 10 minutes.
You don’t have to compulsorily read the book to get paid. You should keep a page of the book opened for 10 minutes to claim bitcoins. Turn the page and leave it for another 10 minutes to claim the bitcoins again.
Only by reading books you cannot earn more, so you should work in this along with bitcoin faucets.