What's a periodical?
A periodical is a magazine, journal, newspaper, or similar item that comes out periodically, i.e. once a week, month, etc.
It's good to be able to distinguish between scholarly and non-scholarly periodicals, especially for more advanced research. See the Scholarly Journals guide for more info.
Magazines
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Scholarly Journals
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If you have a journal or article and you need to check if it is peer reviewed, use the Ulrich's Periodical Directory database.
You'll see something like this:
It's important to know the parts of a citation so you can interpret it correctly. You must have at least the Journal name, volume, issue, and page number to be able to locate the article.