Incoming Resources
- Guinness World Records Limited, London, England, 2019
- Penguin Books, London, England, New York, N.Y., ©2003
- Guinness World Records Limited, London, England, 2021
- Century, London, England, 2020
- Harcourt Brace Jovanovich, San Diego, California, New York, New York, London, England, 1989