References

http://videogames.org/html/  Online March, 1994

http://spaceinvaders.retrogames.com/gameon/ Online May, 2002

http://www.us.playstation.com/aboutSCEA/ Online 2003

http://www.nintendo.com/systems/nes/nes_overview.jsp Online 2002

http://starmen.net/ Online 2003

http://www.cheatcodes.com/exitpage/Games.php Online 2003

http://www.nintendo.com/index.jsp Online 2003

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