Periodicals:
Popular, Professional, or Scholarly Journals
Magazines, newspapers, and journals are called "periodicals" because they are issued on a regular or "periodic" basis.
For Academic purposes, periodicals can be separated into three major groups:
popular magazines and newspapers,
professional publications, and
scholarly journals.
If you are able to recognize the differences among these sources,
you will be able to identify the best information for your research
need.
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