Found an article and you're not sure if it's from a peer-reviewed journal? Check Ulrichsweb.
Type in the journal title or ISSN. If you see the image of a referee's jersey next to the name, you know the journal is "refereed" - also known as "peer reviewed".
Directory of U.S. and international periodicals. No articles, just information about journals.
Current electrical engineering, electronics and computer science literature, featuring journals & conference proceedings from the Institute of Electrical and Electronics Engineers (IEEE) and the Institution of Engineering & Technology (IET) from 1950 to present. Current, archived, and redlined IEEE standards from 1988 to present.
The most comprehensive international index of peer-reviewed literature in behavioral science and mental health. 1887 to present.
Decisions and case law from all state and federal courts, statutes, federal regulations, law review and legal journal articles. 1789-present.
It's easy to get duped on the web (news flash, right?).
Easy things for you to check:
What to do if you see a red flag: