Flip to the end of your article or book and see what sources the author cites. This is a good way to find similar research in a narrow field of study.
Pull keywords from the title or record in the catalog or database. Read the abstract to see how scholars talk about this are of study.
Example (please note that not all databases look the same, but often have similar features):
Now, I'm going to think about what else I want to know and look at the citations: