Getting people to gve the short blurbs I see on book jackets

The nonfiction books I read generally have either a list of, I’m not sure what to call them, recommendations on the back, or in the case of Zondervan, it had four pages of this at the start of the book. That was a waste to me, because I have never heard of 95% of them. I think Thomas has discouraged getting those from people who do not themselves have some sort of platform, though not necessarily a website.

So, in what form should I deliver my pre-publication book to such people? A PDF file, an epub, and something else? The BLB got me thinking about related issues for launching a book. Thanks.