The Review of Literature (ROL) is a collection of scholarly articles written about a topic.
If you have ten points in your lit review (good for you!), just pick the three most important sources and make a power point slide for each one. On the last slide in the presentation, list only the sources you use in the presentation, not all ten sources. You will probably have maybe six slides in all. The presentation should be short!
If you ever have to write a ROL for a thesis or dissertation, of course you will need to have a lot more sources than this. This particular project is an exercise to help everyone learn the procedure for doing a lit review either for school or for a job assignment.
Remember that the lit review is a collection of sources that help make some kind of point. Taken together, the sources will suggest a thesis statement for the power point presentation, and that can be your opening statement i the PPTX.