5. Color Gun – Interactive Art Project Grazio11, Wii Suicide , YouTube LLC, San Bruno CA USA, viewed 17 August 2008, < http://www.youtube.com/watch?v=9JZYEthsP1s >
6. Multi Touch Interactive Environment Multitouch 2008 , FinestFone, viewed 10 August 2008, <http://www.finestfones.com/2008/05/longing-for-multi-touch-on-your.html>
7. Multi Touch – How It Works Tracker 2008 , Natural User Interface (NUI Group), viewed 10 August 2008,<http://www.nuigroup.com/>
8. Multi Touch – How It Works Ynned 2006, Touch-Screen rear projector, Asheville NC, viewed 10 August 2008, http://www.lumenlab.com/forums/index.php?act=Print&client=printer&f=39&t=13277
9. Multi Touch – How It Works Tracker 2008 , Natural User Interface (NUI Group), viewed 10 August 2008,<http://www.nuigroup.com/>