BIBLIOGRAFIA:
 * http://www.monografias.com/trabajos12/algodwxp/algodwxp.shtml#ixzz2fUdaU9Gp

*https://www.google.com.mx/search?q=ubuntu+linux+definicion&bav=on.2,or.r_cp.r_qf.&biw=1280&bih=660&dpr=1&bvm=pv.xjs.s.en_US.RJfod4swqLE.O&um=1&ie=UTF-8&hl=es-419&tbm=isch&source=og&sa=N&tab=wi&ei=pk4-UvuvG4_A9gSi2oDwCw#facrc=_&imgdii=_&imgrc=ZZ8bPPw-jFAPzM%3A%3B7iTge5T9X2rEyM%3Bhttp%253A%252F%252Fdefinicion.de%252Fwp-content%252Fuploads%252F2010%252F04%252Fubuntu.JPG%3Bhttp%253A%252F%252Fdefinicion.de%252Fubuntu%252F%3B224%3B171

*http://www.fayerwayer.com/2012/10/las-8-principales-diferencias-entre-windows-7-y-windows-8/

*http://www.microsoft.com/es-mx/download/windows-xp.aspx?q=windows+xp

*https://www.google.com.mx/search?q=windows+xp&tbm=isch&tbo=u&source=univ&sa=X&ei=_VM-UvXyBIXq8gS1uYC4DQ&ved=0CEsQsAQ&biw=1280&bih=660&dpr=1#facrc=_&imgdii=_&imgrc=BnluEU5LG-E8wM%3A%3BH5FQNzjnVYIjwM%3Bhttp%253A%252F%252Frevistaitnow.com%252Fwp-content%252Fuploads%252F2013%252F04%252FWindows-XP-help.jpg%3Bhttp%253A%252F%252Frevistaitnow.com%252F2013%252F04%252Fsoftware%252Fwindows-xp-dice-adios-en-2014%252F%3B1280%3B1024