Hahn, Harley (1996). The Internet Complete Reference (2nd ed.). Osborne McGraw-Hill. pp. 553. ISBN 978-0-07-882138-7. [...] muds had evolved to the point where the original name was too confining, and people started to say that "MUD" stood for the more generic "Multi-User Dimension" or "Multi-User Domain".
Brian Dear, Chapter 16: "Into the Dungeon", The Friendly Orange Glow, Pantheon Books, New York, 2017; see pages 292–294 for "pedit5", pages 294–297 for "dnd", pages 297–298 for "dungeon".
Carter, Randolph (April 23, 2009). "Psychochild". Grinding to Valhalla. Retrieved April 19, 2010. The MUDs I played extensively: Genocide (where I first used the name "Psychochild"), Highlands, Farside, Kerovnia, and Astaria.
