References

Name: WIKIPEDIA
Title: List of free massively multiplayer online games
URL: http://en.wikipedia.org/wiki/Free_MMOs_and_MMORPGs
Author: Contributors of Wikipedia
Title: Second Life
URL: http://en.wikipedia.org/wiki/Second_life
Author: Contributors of Wikipedia

Name: AVATAR PLANET
Title: History of Virtual Worlds
URL: http://www.avatarplanet.com/history.php
Author: Erik Gordon Bainbridge

Name: 10NEWS
Title: Is Virtual World A Danger To Children?
URL: http://www.10news.com/newsarchive/18028483/detail.html
Author: Juliette Vara

Name: TEEN SECOND LIFE
Title: Second Life Technology
URL: http://teen.secondlife.com/whatis/technology
Author: Teen Second Life group

Name: Scifi
Title: Left 4 Dead
URL: http://www.scifi.com/sfw/games/sfw19914.html
Author: Kenneth Newquist

Name: AuditionSEA
Title: Game Info
URL: http://www.auditionsea.com/intro/game_info.aspx
Author: AudionSea group