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"The Evolution of the Computer -- from 1613 to 2013." BetaNews. N.p., n.d. Web. 24 Sept. 2015.
"The Engines." The Engines. N.p., n.d. Web. 24 Sept. 2015.
"Computer History Museum | Timeline of Computer History : Computers Entries." Computer History Museum | Timeline of Computer History : Computers Entries. N.p., n.d. Web. 24 Sept. 2015.
"What Is an Abacus?" UCMAS. N.p., n.d. Web. 24 Sept. 2015.