Cite an image used in a PowerPoint presentation or web project the same way you would cite it in a printed paper. See the example in our post on citing a screenshot or frame capture in a caption. As the post explains, if the image is merely illustrative, provide full publication details in a caption. But if you refer to the source of the image elsewhere, the caption should provide only enough detail needed to key to a works-cited-list entry. The list of works cited may be included as the final slide or as the last page of the web project.