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homepage.cs.uri.edu/faculty/wolfe/book/Readings/Reading03.htm
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www8.hp.com/us/en/hp-information/about-hp/history/hp-timeline/timeline.html
History.com Staff. (2011). Invention of the PC. Retrieved September 26, 2016, from http://www.history.com/topics/inventions/invention-of-the-pc
homepage.cs.uri.edu/faculty/wolfe/book/Readings/Reading03.htm
CHM Revolution. (n.d.). Retrieved September 27, 2016, from http://www.computerhistory.org/revolution/birth-of-the-computer/4/85/346
www8.hp.com/us/en/hp-information/about-hp/history/hp-timeline/timeline.html