Bibliography

• 3D Worlds by categories: http://www.virtualworldsreview.com/info/categories.shtml
• General review sites: Virtual Worlds Review, 28 worlds listed, 4/06. http://www.virtualworldsreview.com/
• Allwood, Jens and Ralph Schroeder (2000). Intercultural Communication in a Virtual Environment. http://www.immi.se/intercultural/nr4/allwood.htm
• Bartle, Richard (2003). Designing Virtual Worlds. New Riders Games; 1st edition. ISBN: 0131018167. http://www.mud.co.uk/dvw/
• Bungert, Christoph  (2006). HMD/headset/VR-helmet Comparison Chart. http://www.stereo3d.com/hmd.htm

•  Castronova, Edward   (2005) Synthetic Worlds: The Business and Culture of Online Games. University Of Chicago Press. ISBN: 0226096262. Interview: http://www.press.uchicago.edu/Misc/Chicago/096262in.html
  
• Danaher, Simon (2005). Creating 3D Worlds: With CD-ROM. Barron''s Educational Series. ISBN: 0764178431
• Daniel Terdiman (2004-12-02). Gamers Eye Open Virtual Worlds. http://www.wired.com/news/culture/0,65865-0.html
  
• Fuhrer, Patrik (2006).  A Software Framework for Massively Distributed Virtual Worlds. http://diuf.unifr.ch/softeng/projects/madviworld/
  

• Madsen , Kim H. (Editor), Lars Qvortrup (Editor)   (November 19, 2002). Production Methods: Behind the Scenes of Virtual Inhabited 3D Worlds. ISBN: 1852336129
• Manninen, Tony & Jani Pirkola (1998). Comparative Classification of Multi-User Virtual Worlds. Raahe Computer Laboratory of Oulu University.  Note: useful comparison table. http://www.tol.oulu.fi/~tmannine/game_design/multi-user_virtual_worlds.pdf
  

• Slator, Brian M. (April 2006). Electric Worlds in the Classroom: Teaching and Learning with Role-Based Computer Games. Teachers College Press. http://store.tcpress.com/0807746754.shtml