When giving a speech, cite your sources orally. Provide enough information to allow an audience member to locate the source. Typically, you should include:
Additionally, consider offering a brief statement about your source’s credibility by stating the source’s connection to the topic.
When you use PowerPoint, be sure to cite sources for any direct quotations or images appearing on a slide. Write the information in a small font in a textbox at the bottom of the slide or under the image.
If you use a graphic from the Internet, you should cite it, too.
Your instructor may also expect you to include a bibliography slide at the end of your slideshow. Your bibliography should not take the place of appropriate oral citations offered during your presentation.
Publication Manual of the American Psychological Association by 
