OK, thanks for the clarification. I obviously don't know much about them.
I looked at what sounds like the same book earlier today on Amazon (had a $10 PRIME credit which had to be used today from WFM) but a couple of the reviews sounded like the buyers were a little disappointed with the lack of detail:
https://www.amazon.com/dp/1886768374...v_ov_lig_dp_it
Robert