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.
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Magazines
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Scholarly Journals
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Directory of U.S. and international periodicals. No articles, just information about journals.
Provides research writers with information for submitting articles to major journals such as acceptance rate, open access type, average time to review, plus journal impact factors and altmetrics.
To find out if a journal is considered peer reviewed, check the Ulrich's database by doing a search for the title of the journal.
If you see a little referee shirt icon then the journal title is considered peer reviewed.