Articles in peer-reviewed or scholarly journals almost always report original research. The article will usually have these elements:
Not all items that appear in peer reviewed journals are actually peer reviewed. Articles that require a certain level of scholarly effort such as research studies, experiments and literature reviews are peer reviewed. Items appearing in peer reviewed journals that are not peer reviewed are;
Keep that in mind when you limit your search to peer review. The results list may contain some of the above items that are not peer reviewed. Make sure you check what type of item you are looking at before you assume it is peer reviewed simply because it appears in a peer reviewed journal.
Most library databases contain a variety of materials including magazines, scholarly journals, newspapers, etc. You can limit your search to include only those articles from scholarly or peer-reviewed journals. Below is an example from the Academic Search Complete database:
NOTICE OF NONDISCRIMINATORY POLICY AS TO STUDENTS
The New York Medical College admits students of any race, color, national and ethnic origin to all the rights, privileges, programs, and activities generally accorded or made available to students at the college. It does not discriminate on the basis of race, color, national and ethnic origin in administration of its educational policies, admissions policies, scholarship and loan programs, and athletic and other school-administered programs. See full non-discrimination statement with contact info.