If your professor told you to use scholarly, or peer-reviewed, sources for your assignment, you need to find an article published in a peer-reviewed journal. Use a library database to locate articles, then check for the following features:
Is this an article that was published in a journal? (Hint: Look near the bottom or top of the page for a journal name, volume number, issue number, year and page numbers.)
Does the article tell you where the author works (and maybe their contact details)? (Hint: Look for footnotes by the author's name.)
Is there an abstract at the beginning of the article? (A summary of the article, written by the authors.)
Does the article end with a bibliography or list of works cited? (There could also be extensive footnotes.)
Is the language in the article more technical than a typical magazine or newspaper?
Does the article's formatting look really boring? (No advertisements or glossy color pictures.)
If you answered YES to most of these questions, the article you're looking at is probably scholarly!