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Library search engines (databases) are a great place to find scholarly journal articles or other sources for your paper. Each search engine has a different flavor/subject area it covers. If the full text isn’t right there, click the Find It button. If we don’t have the article, you can request it from another library by clicking the “get this article or book chapter” link. (The turnaround time on this is usually about 2 days.)
That's not all though. Don't forget to think about who wrote the articles and who they are written for. Scholarly articles are written by...wait for it...scholars. And by scholars, we mean professors, researchers, and scientists: people who are experts in their fields. So who writes popular articles? For the most part it's journalists, whose expertise is usually writing, not the content area they are writing about.
As for audience, scholarly articles are written for other experts in the field and students in those areas. This means you'll sometimes get words or specialized terms that you may not know. Don't be afraid to look them up. Popular sources are written for everyone, so you get generalized language that might be a bit less specific.
Basically, they fit these criteria:
Articles written by professors or researchers
Designed for students, professors, & researchers
Articles reviewed in-depth by other researchers before publication
The articles will also contain a bibliography at the end of the article.