Check with your professor to see if they have a specific citation style that they would like you to use. You can find more information on specific citation styles on the library's Citation Station guide.
When citing your sources, consider where your citations would fit best in your story. For example, if your story is slide-based, you may want to utilize footnotes on each slide. If this approach wouldn't fit well with your story, you could instead include citations in a "credits" section at the end of your story.