Study Design 101, a tutorial from SUNY Downstate Medical Center, covers the basics. Note the top levels of the pyramid —
are the gold standard for evidence. These are the types of study you will want to look for first in the library databases.
Additional information, including MEDLINE terms for types of studies, is at Evidence-Based Practice in Applied Health: Levels of Evidence, a tutorial from the University of Illinois at Chicago
You can find CINAHL, Cumulated Index to Nursing & Allied Health Literature, on the database page.
You can find Medline via PubMed on the database page.
Note: Not all article types may be visible on the screen. If you do not see the type you are looking for, click the Additional Filters button to find the article type(s) you want. Check them off and click the Show button to have them appear on the screen. You still have to click on a filter to activate it.