Often times you might hear your professors tell you that they want an article that is either
peer reviewed;
academic;
scholarly; and/or
refereed
These are all actually the same thing.
Check out this short video to learn more about what peer review means:
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Popular Sources
Works that are published by staff or freelance writers who do not have to have their work peer reviewed before publication. These can be useful for community perspectives or popular opinion as examples in a paper, though they should be supported by more scholarly evidence.
vs.
Scholarly Sources
Works that have gone through a more detailed approval process for publication - usually peer review for articles or through an editor at a University Press. Because they have gone through editors and/or peer review, these tend to be less likely to contain mistakes and are written by experts in the field for others researching in the same field.