Primary (sometimes called "empirical") articles will usually include some of the following subheadings.
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Academic Search Complete (Ebsco) contains the library's largest collection of peer-reviewed journals.
Research Library (Proquest) is a collection of magazines, newspapers and some peer-reviewed journals where you can find "primary articles".
PLOS One is a searchable collection of peer-reviewed, open access journals.
Google Scholar includes some primary articles. If you can't get the full text free, see if Ebsco has it, or ask a librarian to get it for you.