The book is a good attempt at an overview, yet this is also its downfall. I have real difficulty when academic authors (and I have been an academic) make bald statements without footnotes. The footnotes would not have had to be extensive, just indications of where they got their ideas, so I'd be able to follow through on my own. I'm unwilling to accept everything they say just because they say it, and I have studied enough and participated in enough discussion to be unwilling to accept their authority without questioning. That's all I would have needed to give it a higher rating, a clarity about where and why they got some of their ideas.