Just being in print or available via the Internet doesn't guarantee that something is accurate or good research. When searching the Web, it's important to critically evaluate your search results:
Look for articles published in scholarly journals
or sources that require certain standards or criteria be met before publication.
Look for materials at Web sites that focus on scholarly resources
(e.g. Google Scholar)
Compare several opinions
by scholars in your topic field, which is another way to verify or evaluate your sources.
Consult your instructor.