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Peer-reviewed journals (also called "scholarly" or "academic" journals) contain original research articles within a specific subject domain.
These articles are reviewed by other experts before publication and share many or all of these qualities:
Here are two examples:
NOTE: Some peer-reviewed journals will include literature reviews, book reviews, and opinion essays. None of these present original research however!
This list may help you get started, but is by no means complete! Try using these keywords, or combinations of keywords, within LOPERSearch or other library databases.
For example: gender AND "income distribution"