I come across books that sound interesting, but always want to check out reviews from people who have read it before me before making the decision to buy it.<p>What is your process to evaluate if a nonfiction book is worth buying or not?<p>Do you have a process to evaluate this? Do you have a sequence of things you check, for example, the table of contents, the author's history, etc?<p>Is there something specific you look for when you buy an e-book?