Books
- Pilot’s Handbook of Aeronautical Knowledge(FAA-H-8083-25B). (2016). Oklahoma City, OK: United States Department of Transportation, Federal Aviation Administration, Airman Testing Standards Branch.
Multimedia
- https://airandspace.si.edu/support/wall-of-honor/elrey-borge-jeppesen-0
- https://www.historynet.com/jimmy-doolittle-reminiscences-about-world-war-ii.htm
- https://simpleflying.com/boeing-707-why/
- https://samchui.com/2019/03/02/concordes-first-flight-fifty-years-ago/#.X9wg2WRKg-Q