In college, you are often required to use scholarly (aka academic, peer-reviewed) sources.
CHECK:
Was it written by experts? They're affiliated with a university or provide their educational background (e.g. PhD).
Is it based on research? The findings are based on a study conducted or on a review of other expert literature. There MUST be a bibliography or works cited list.
Who is the intended audience? Scholarly sources will use complex, expert language and be fairly lengthy. Most academic research is published in peer-reviewed journals or books, not freely available thru Google.
Find out more about scholarly research with this quick video.
Citing Sources
Every time you use someone else's ideas (even if you explain the idea in your own words), give credit in your bibliography AND in the text of your paper.