1. Kaneko, M., Kondo, K.: The Golden Rule of Character Making, Born Digital Co., Ltd. (2010)
2. Law of Successful Character Design, PIE International (2010)
3. Recca Sha Corp.: Book for Quick Understanding of "Local characters" in Japan, PHP Bunko (2009)
4. http://www.public-domain-image.com/objects-public-domain-images-pictures/parade-balloon-character.jpg.html
5. Weaver, W., Shannon, C.E.: The Mathematical Theory of Communication. University of Illinois Press, US (1949)