http://www.cgmeetup.net/home/sonic-boom-behind-scenes/

http://www.gamespot.com/articles/sega-explains-sonic-and-knuckles-new-look/1100-6418328/

http://www.cgmeetup.net/home/sonic-boom-behind-scenes/

http://www.cgmeetup.net/home/sonic-boom-behind-scenes/

http://www.nintendolife.com/news/2014/02/sega_unleashes_sonic_boom_behind_the_scenes_video

http://www.cgmeetup.net/home/sonic-boom-behind-scenes/

http://www.gamespot.com/articles/sega-explains-sonic-and-knuckles-new-look/1100-6418328/

http://www.cgmeetup.net/home/sonic-boom-behind-scenes/