Google Scholar can also be used to find articles, especially if you're not finding enough articles in Search@CULibraries or in the individual databases. However, each journal will need to be evaluated to determine if it's peer reviewed or not. You can do this by finding the journal's homepage and reading the "about" section or the section for author guidelines/submissions. Usually in one of these areas a journal will mention their peer review process, if they have one.
It's very helpful to change the settings in Google Scholar so that results will full text from the CU library will be linked from Scholar. To change your settings (it's easy!), watch this quick 2 minute video.