An article from a peer reviewed (refereed) journal

peer review
  • Peer review is a special process whereby articles published in a particular journal are first read by a panel of experts to ensure the quality of the research. Many databases will include a checkbox by which you can limit a search to just peer reviewed journals.
  • If you're not sure that an article you have found is peer reviewed, research the journal in Serials Directory, which will tell you if it is.