Sources
References
http://searchsoa.techtarget.com/definition/software
http://www.webopedia.com/TERM/O/operating_system.html
https://en.wikipedia.org/wiki/Bill_Gates
https://www.techopedia.com/definition/5435/graphical-user-interface-gui
http://www.gcflearnfree.org/
http://www.computerhistory.org/timeline/1933/
Video
https://www.youtube.com/watch?v=teoZk3QEc40&feature=youtu.be
https://www.youtube.com/watch?v=d1pvc9Zh7Tg&list=PLQsxaNhYv8dbK3yMHXk35jtZFdu7o46gu&index=3
https://www.youtube.com/watch?v=U4lweHnf71E&index=15&list=PL4316FC411AD077AA
Picture
https://en.wikipedia.org/wiki/Steve_Jobs_(book)#/media/File:Steve_Jobs_by_Walter_Isaacson.jpg
https://en.wikipedia.org/wiki/Software
http://www.capterra.com/history-of-software
http://switchtoamac.com/guides/mac-os-x/desktop/the-mac-os-x-desktop.html
https://pixabay.com/es/ordenador-port%C3%A1til-internet-realidad-1104066/
https://pixabay.com/bg/
https://en.wikipedia.org/wiki/Linux#/media/File:Ubuntu_15.10_with_Firefox_and_Nautilus_open.png
https://pixabay.com/es/contrase%C3%B1a-palabra-clave-palabra-866981/
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