Make sure you use these two as sources, as they are required, and the third one can be of free choice (preferably primary source). One is a website, https://www.olympic.org/berlin-1936, and the second one is a video on YouTube, https://www.youtube.com/watch?v=1inifMJ0xio.
The essay must be clearly and effectively organized. It must contain critical analysis that is focused clearly on the question being investigated, and must also include the conclusion that is drawn from the analysis. The use of evidence to support the argument must include 3 sources either primary or secondary.