The Name of The Book?

We have created a new and unique puzzle map: The Name of The Book?. You work in the library and need to find out the name of your boss his favourite book (You'll get a present!). Trade with villagers (they can be found everywhere in the map) for clues.
It is highly recommended to play the map with full brightness

Rules:
1. Don't break or place any blocks
2. Play on peaceful (This should already be locked)
3. Don't throw random stuff in the hoppers, this might mess up the system