- ↑ 1.0 1.1 1.2 1.3 1.4 Sonic Channel (Japanese). Characters: Knuckles. Sega. Archived from the original on 26 May 2019. Retrieved on 3 July 2015.
- ↑ 2.0 2.1 2.2 media:CS K US.png
- ↑ Sega of America. Knuckles the Echidna. Sonic Characters. Sega of America. Archived from the original on 5 March 2005. Retrieved on 26 October 2017. “Knuckles was born alone on Angel Island, brought into this world to defend the Master Emerald. That is Knuckles' destiny and fate. If Sonic exemplifies the wind, then Knuckles is the mountain: stern and unmovable. Knuckles is quick to anger, but cool and determined in battle. Even though he considers Sonic his friend, the disposition of the Master Emerald is his ultimate concern. His determination to protect the gem from harm or ill use is set in stone and is unshakable. He is often envious of the adventurous lifestyle Sonic lives and the fame that has followed from Sonic's deeds, but Knuckles is well known in his own right, as a treasure hunter versed in the martial arts.”
- ↑ 4.0 4.1 4.2 4.3 Sonic the Hedgehog 3 (Sega Mega Drive) Japanese instruction manual p. 34-36.
- ↑ Sonic & Knuckles game manual
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