1. Networked virtual environments: design and implementation;Singhal,1999
2. The future vision of simulation in health care;Gaba;Qual Saf Health Care,2004
3. What we know about designing and delivering team training: tips and guidelines;Salas,2002
4. Snow crash;Stephenson,1992
5. Wikipedia. Virtual world. Available at: http://en.wikipedia.org/wiki/Virtual_world. Accessed March 3, 2007.