Anarres. A Cartoon Person. Digital image. openclipart. N.p., 30 Sept. 2013. Web. 27 Aug. 2015. <https://openclipart.org/detail/184026/a-cartoon-person>
Your audience has no reason to believe you! It's your job to convince them that you are an authority on the subject.
You prove you know what you are talking about by citing credible sources in your speech. Your sources demonstrate that you have done your research and that you are credible because your sources are.
Note: Because every word counts in a speech, concentrate on including the book, journal, or newspaper title.
Book: "According to 1001 things everyone should know about African-American history..."
Journal: "In an article in the journal Space Debris..."
Periodical/Newspaper: "The New York Times published a story about...."
When citing your sources on a PowerPoint slide, provide a full citation rather than a long URL such as you might obtain from Google.
For example, which citation is your audience more likely to read:
Gillis, J. (2015, November 28). Short answers to hard questions about climate change. New York Times. https://www.nytimes.com/interactive/2015/11/28/science/what-is-climate-change.html
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