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This video, from the NC State University Libraries, explains what it means for a source to be credible and why is it important to use these sources.
Websites should have an overview page, called "About This Site," or a Site Map; these will help you find specific information quickly. Look at the domain letters at the end of the URL to identify the type of site.
.edu educational sites
.gov government sites
.net network access companies
.org non-profit organizations
.int international organization
GENERAL EVALUATIVE CRITERIA
How to identify valuable sources for your research? Evaluate each source for...
Is information verifiable using other sources like encyclopedia articles, government documents, statistical data, or primary sources?
Are there obvious typos or other errors?
Are other researchers citing this source?
Who is the intended audience (scholars, the general population, a specific group, fans) ?
Does the vocabulary level and use of special terminology indicate intended audience?
How do your research needs compare with those of the intended audience?
Who is responsible for the presentation of this information? (publisher, news agency, funding agency, etc.)
What are the author's credentials? (education, institutional affiliation, previous research, honors, etc.)