References
http://webwork.utleon.edu.mx/Paginas/Libros/E%20-%20The%20Story%20of%20a%20Number.pdf
http://www.ebyte.it/library/educards/constants/MathConstants.html
https://en.wikipedia.org/wiki/E_(mathematical_constant)
(5) Leonard Euler. (1998). In Encyclopedia of World Biography. Detroit, MI: Gale. Retrieved from
http://link.galegroup.com/apps/doc/K1631002086/BIC?u=purdue_main&sid=BIC&xid=f53da831
(6) Bradley, R., & Sandifer, C. (2007). Leonhard Euler life, work and legacy (Studies in the history and philosophy of mathematics ; v.
5). Amsterdam ; Oxford: Elsevier.
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