Reddit reviews Shinto in History: Ways of the Kami (Routledge Studies in Asian Religion)

The books by Mark Teeuwen and John Breen

A New History of Shinto

and

Shinto in History: Ways of the Kami

They're great works on the history of Shinto, from an academic perspective. They're revisionist works in the sense that they challenge the old ideas about what Shinto is and how it came to be, that might sound like they're fringe works, but it's rather that the study of Japanese religion is a very modern topic where new research is conducted right now. These books are a part of modern Shinto studies that are based in modern research.