Can You Trust This Book?
Apply the 
test
Just because something is printed in book format or available in a college library doesn't mean you can automatically trust the content or that it's appropriate for your need. Many non-fiction books are written purely for entertainment, and others appear to be "factual" but in fact are not based on research.
To make the most of your research time you want to use sources that are credible (trustworthy) and appropriate for your needs. The ASAP Test can help you make that determination.
The ASAP Test for Credibility and Usefulness:
Age. Sources. Author. Publisher: Let's look at each of these criteria.