Your professor is asking you to find a peer reviewed / scholarly article. This can sometimes be tricky, so this page is going to explain what a peer reviewed article is, and how to see if a journal is peer reviewed.
Scholarly Journals (Peer-reviewed/Referreed)

- Authors are authorities in their fields.
- Authors cite their sources in endnotes, footnotes, or bibliographies.
- Individual issues have little or no advertising.
- Articles must go through a peer-review or refereed process.
- Articles are usually reports on scholarly research.
- Illustrations usually take the form of charts and graphs.
- Articles use jargon of the discipline.

