1. Anderton, K.: The business of video games: a multi billion dollar industry. Forbes. (2017) https://www.forbes.com/sites/kevinanderton/2017/04/25/the-business-of-video-games-how-much-is-being-spent-and-why-infographic/#74108c0f6fe8
2. Aspray, W.: Computer: A History of the Information Machine. Basic-Books, New York (2004)
3. Bohannon, J.: Flunking spore. Science. 322(5901), 531 (2008)
4. Dillon, R.: The Golden Age of Video Games: The Birth of a Multibillion Dollar Industry. CRC Press, Boca Raton (2016)
5. Glenday, C.: Guinness World Records 2009, GUINNESS WORLD RECORDS. Random House Publishing Group (2009) New York City, New York