Definition: what is an authority book?
An authority book is a nonfiction book written by a professional to establish credibility in a specific niche. It usually solves one problem for one kind of reader, using the author's method, experience, or story. It does not need to be long. Defining Moments Press even teaches, in its 7-Figure Book Method, how to turn a short book into a business. What separates an authority book from a general book is intent: every chapter supports the work the author already does, so readers who finish it know exactly who the author helps and how.