Glass Owl
We don't see general books being published about Oracle deck reading as each deck has its own system and cards are all different. Most oracle decks come with a booklet or a book. Those are written specifically for that particular deck and its system.Btw, as much as I could see, a lot of books and study materials had been written about Tarot, but were there any books written about Orcale Cards and Oracle reading?
Tarot books that contain spreads may be useful for oracle deck reading as usually those spreads work fine (or can be modified) to use with oracle decks.