By using the specialist resources like CINAHL or Medline:
If you are looking for a specific journal article, you can use Library Search to search for it. Enter the title of the article into the box and and select the 'Library Search' dropdown option.
If you don't find the article you can try the advanced search and select title ...is (exact) from the dropdown menu.
You can also use Library Search to find articles on a topic of interest. Enter a few keywords or search terms and select the 'Library Search' dropdown option.
From your results you can filter to select either just Articles or Peer-reviewed Journals.