PsychArticles - From the American Psychological Association, this is--as the site describes itself--"a definitive source of full text, peer-reviewed scholarly and scientific articles in Psychology." The database covers approximately 80 journals. Click here for a tutorial.
Psychology and Behavior Sciences Collection - Includes 570 full-text journals and 48 books. The database also includes full-text content from relevant magazines and health reports. Coverage is particularly strong in child & adolescent psychology and various areas of counseling.
Other Library Databases - such as those listed on the Library Home page--Databases page under education, criminal justice, or any topic which might include psychological aspects of your topic.
Try adding psychol* or study as additional search terms.
Google Scholar - Choose articles that have the "View as HTML" link. These are available for no cost.