The "Who" Clue
Something About the Author ...
Knowing who created a document and a little bit about that person's background can tell you a lot about the content, such as whether or not the author has sufficient expertise to back up his or her arguments or the degree of bias reflected in the work.
The author's name won't always be indicated, but if it is, look for biographical information about that person. Choose biographical resources that are deemed credible; the library offers a wide selection of tools to help you find biographies.