Incoming Resources
- Guinness World Records Limited, London, England, 2018
- Guinness World Records Limited, London, England, 2019
- Viking, London, England, New York, USA, 1990
- EDC Pub., Usborne, Tulsa, Okla., London, England, 2007
- Penguin Group, London, England, New York, N.Y., 1994
- Guinness World Records Limited, London, England, 2016
- Guinness World Records Limited, London, England, 2017