↑ Bartle, Richard (2003). Designing Virtual Worlds. New Riders. m/s. 9–10, 741. ISBN0-1310-1816-7. [hlm. 9-10] TinyMUD was deliberately intended to be distanced from the prevailing hack-and-slay AberMUD style, and the "D" in its name was said to stand for "Dimension" (or, occasionally, "Domain") rather than "Dungeon;" this is the ultimate cause of the MUD/MU* distinction that was to arise some years later. [pp. 741] The "D" in MUD stands for "Dungeon" [...] because the version of ZORK Roy played was a Fortran port called DUNGEN.
↑ Hahn, Harley (1996). The Internet Complete Reference (edisi 2nd). Osborne McGraw-Hill. m/s. 553. ISBN0-07-882138-X. [...] 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".
↑ Bartle, Richard (2003). Designing Virtual Worlds. New Riders. m/s. 3. ISBN0-1310-1816-7. Confusingly, although the term MUD applies to virtual worlds in general, the term MU* does not—it's used strictly for text-based worlds. The introduction of computer graphics into the mix therefore caused a second spate of naming, in order to make a distinction between graphical MUDs and text MUDs.
