A literature review means looking through the scholarly, peer-reviewed literature on your topic to find what others have written about it. This is different than just doing a general search of the open Web (via Google for example). The scholarly literature is written by people who are experts in their field, often describes or reports on research that those experts have done, and then has been reviewed by other experts in the same field before being published.
There are specific search engines or databases that you need to use to find this literature. It is often not available through a search of the open web.
Often, the article that you need will have the PDF available. If not, click on the Find it at UofL button.
There will then be 2 choices: