This document provides instructions for evaluating the credibility of sources found in books. It lists 7 questions to consider when assessing a book's authority, affiliation, currency, audience, purpose, sources, and overall usefulness. The questions address the author's expertise, the publisher's bias, date of publication, intended reader, goal, citations, and whether the book remains relevant after closer inspection. Answering these questions allows one to perform a more thorough evaluation of a book source.