PsycINFO is one of a series of products from the American Psychological Association. It list peer-reviewed literature in the behavioral sciences and mental health, broadly interpreted, making it a tool for scholarly research in a host of disciplines. Citations reference journal articles, books, and dissertations.
Psychology researchers will also want to be familiar with these specialized indexes. They're not as user-friendly as some products, so consider asking for assistance if you don't get the results you expect from a search