Authority

Since this book is so related to what I do professionally over at LiberWriter, I wrote it up in the blog over there:

http://blog.liberwriter.com/2013/11/21/nathan-barrys-authority/

I thought it was pretty interesting, although you can probably pick up some of the same advice on the internet if you have the time to do the research yourself.  If you're a professional who could package up some of your knowledge and sell it, this book would easily pay for itself, though, as it's got lots of great advice on how to write and market a book that will help people with their jobs.