If a book appears with a "Best Vendor Listing*, I assume the generic "best seller guide" is all right, but I don't like it much. If not, "best-advertising book* is exactly what I might count on to explain a e-book that marketed or is providing well without reference to it https://www.cureayu.com/blogs/pcod-pcos-wellness/navigating-the-menstrual-cycle-phases-a-comprehensive-journey-through-womens-reproductive-health