Fisher, Lawrence M. (6 de septiembre de 1994). «Microsoft Is Bringing Out Its First Computer Keyboard». The New York Times. ISSN0362-4331. Consultado el 17 de junio de 2016. «The Microsoft "Natural Keyboard" has 104 keys, 3 more than standard personal computer keyboards, and will provide short cuts to Microsoft's Windows software.»
nytimes.com
Fisher, Lawrence M. (6 de septiembre de 1994). «Microsoft Is Bringing Out Its First Computer Keyboard». The New York Times. ISSN0362-4331. Consultado el 17 de junio de 2016. «The Microsoft "Natural Keyboard" has 104 keys, 3 more than standard personal computer keyboards, and will provide short cuts to Microsoft's Windows software.»