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Sara.TillSeveral sources are utilized in compiling Dr. Knowles' argument. Much of the historical information comes from first-hand accounts provided at the time and compiled for posterity. A good portion of information also emerges from news articles produced in the wake of the event. This includes interviews and press releases. Historical court documentation and correspondences between parties are used for depiction of events and subsequent investigations. Several aanalysis pieces by historians also appear to be used. When discussing the parallels between scenarios, Dr. Knowles relies on his own logic to fully connect the events.