Trying to figure out if the journal that published the article you have is peer reviewed? Here are some steps you can follow to determine that!
1. Check the journal's website, and see if it refers to using the peer review process.
2. Search the journal title in Ulrich's Periodical Directory, a database that will give you all sorts of information about a journal, including whether or not it uses the peer review process.
3. It's also a good idea to read the article closely, and see if it adheres to rigorous research principles!