Dear, Brian. Chapter 16: Into the Dungeon. The Friendly Orange Glow: The Untold Story of the PLATO System and the Dawn of Cyberculture. New York: Pantheon Books. 2017: 294–297 [2021-02-21]. (原始内容存档于2021-03-04).
Dear, Brian. Chapter 16: Into the Dungeon. The Friendly Orange Glow: The Untold Story of the PLATO System and the Dawn of Cyberculture. New York: Pantheon Books. 2017: 294–297 [2021-02-21]. (原始内容存档于2021-03-04).