When you are determining whether or not the article you found is a peer-reviewed article, you should consider the following.
Many of the SVC databases provide an option to select "peer reviewed" sources.
To find them:
A primary difference between scholarly journals and other types of journals and magazines is that articles in these journals undergo a "peer review" process before they are published.
What is the process for an article to become "peer-reviewed"?
Because a peer-reviewed journal will not publish articles that fail to meet the standards established for a given discipline, peer-reviewed articles that are accepted for publication exemplify the best research practices in a field.