In databases limit your results to peer-reviewed or "scholarly articles." If the database doesn't have this option, look the journal up in Ulrich's International Periodicals Directory. Ulrich's identifies peer-reviewed (refereed) journals with this icon:
Review articles provide an overview of a topic, providing many key references. Search for review articles in the databases, by applying limits for "reviews" or "review articles"
If you search a database and the full article's not there, don't despair. Look for the "FindIt" button: or FindIt@BC. Find It will offer help including: