I have to find only peer-reviewed articles for my assignment. How do I know if an article is peer-reviewed?
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1.  When searching for articles in databases, limit your search results to peer-reviewed content.  Most databases provide this option, usually by checking a box on the search or advanced search page:
 
                   
You can look up the journal in Ulrich's Periodicals Directory (shelved downstairs at - Z6941 .U5). The journal title index in v. 4 will show a black arrowhead by any title that is peer-reviewed.