- ↑ 1.0 1.1 1.2 Sonic Channel (Japanese). Characters: Sonic. Sega. Retrieved on 3 July 2015.
- ↑ Sonic the Hedgehog Technical Files
- ↑ 3.0 3.1 Sega of America (February 2004). Sonic Central. Sega of America. Archived from the original on 24 January 2004. “Sega.com: When Sonic and his friends sit down to eat after a long hard day of chasing Dr. Eggman, what do they like to eat? / Yuji Naka: They probably eat McDonald's® hamburgers, I suppose? And I think they will get a complete line-up of Happy Meal® premiums.”
- ↑ Pedigree Books (August 2013). "Sonic's Count the Rings Time Trial". Sonic the Hedgehog Super Interactive Annual 2014. Pedigree Publishers. p. 9. ISBN 978-1908152077. "Fact: Sonic hates lies and always searching for the truth!"
- ↑ Cite error: Invalid
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