Da quanto leggo in questo articolo:
Praise For [book Title] – Tagari.com si potrebbe tradurre con "testimonianze su..." oppure "Apprezzamenti per..."?
"There are a few schools of thought on where testimonials should go in a book. Some people believe that they should be close to the front, so that
potential readers can see them right away and get a sense of what the book is about. Others believe that testimonials should be interspersed throughout the book, so that readers can see them in context and get a sense of how others have reacted to the book. Ultimately, it is up to the author to decide where to put testimonials in their book".