After you find a source, you still need to decide whether you want to use it in your assignment. Ask yourself the following questions before you commit to reading a full book or article:
How current is the source? If your topic requires up to date information, you need to pay careful attention to the date of publication.
Who is the author? Look for a brief biography of the person or a description of the organization. Most scholarly articles will simply identify the universities where the authors work.
How accurate is the source? Are they citing their sources? Look for bibliographies or footnotes. On websites there may also be links to their sources - dead links are a bad sign.
How relevant is the source? Does the information actually fit your topic or would you be forcing it to work? Quickly read these sections to determine this:
Can you trust the information in the sources you located during your research? How skeptical should you be of the source and its author?
There are a few things you should consider when evaluating a website's credibility that you normally don't worry about with books and articles:
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