The Trinity and the Lord of Spirits, by John Young

De young rejects the myth that christian trinitarianism was a later accretion to ther religion. The main focus remains in continuity of belief from the old testament, not specifics of apostolic era worship as compared to later worship. We get almost nothing onritual as opposed to doctrine. De yung gives much less direct evidence that this meant a third hypotesis, but he none the less draws that conclusion.