Types of Sources and What They Can Tell You See examples of a wide variety of primary sources and gain a better understanding about what information can be obtained from different types of documents. How To Identify Reputable Sources With so many books, articles, and websites to read, how do you trust the information you find? Learn what to look for in reliable secondary sources. How To Think About Sources and "Read" Them Discover how to look at sources for clues, and how to use documents together to both verify and sometimes discount your findings. Links to Online Sources