Here's an example of a search in ERIC to find peer reviewed empirical studies on a topic.
In ERIC or PsycINFO, you can limit your search by publication type or method.
If you're not sure how a topic is described in ERIC, look up your keywords in the ERIC thesaurus. Look at the scope note (description of a term's usage in ERIC), broader terms, narrower terms, and related terms to help you find other terms about your topic. Then add the descriptors (subject terms) you find to your search to make it more specific.
The Google Scholar Cited By feature will identify subsequent citations to articles that might be relevant to your research.