^Dodge, Martin; Kitchin, Rob (2000-09-02). Mapping Cyberspace. Routledge. p. 153. ISBN0-415-19884-4. "One interesting approach that attempts to achieve this is, is one which automatically records movement through MUD space, using this information to dynamically map the spaces visited. Such an approach has been adopted by the zMUD client, from Zugg Software, which includes the automapping tool shown in figure 8.5. zMUD can be configured to decode the room descriptions, and to record the standard cardinal walking directions, teleports and one-way links."