A peer-reviewed article will:
Library Search has an option to limit your results to peer-reviewed journals.
Be aware that not all articles in peer-reviewed journals are refereed or peer reviewed, for example, editorials and book reviews.
Many databases allow you to limit your search to peer-reviewed articles.
Check for an option to do this when you search the database. For example:
Check a database's help or about pages to see if it includes peer review information.
Some databases include only peer-reviewed journal articles. For example: