You do need to cite your sources in an oral presentation, just like you would in a paper. Here are some tips for how you can do this:
For slides (or other presentation materials), use the same guidelines for citations in your presentation as you would a paper:
Keep track of the sources you find as you do your research. It's much more efficient to save the formatted citation (in Chicago Style 17th edition Author-Date, of course) when you find a relevant article then to have to find it later.
For generative AI tools (ChatGPT, Bard, Perplexity, etc.), some style guides have published their thoughts on citing artificial intelligence. Please check your assignment or course syllabus, or ask your professor if you're unsure about appropriate use of AI in your work.