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Shultz, H. S., & Leonard, B. (1989). Unexpected occurrences of the number e. Mathematics Magazine, 62(4), 269. Retrieved from http://dist.lib.usu.edu/login?url=http://search.ebscohost.com/login.aspx?direct=true&db=msn&AN=MR1572769&site=ehost-live

Swenson, C., & Yandl, A. (1993). An alternative definition of the number e. College Mathematics Journal, 24(5), 458. Retrieved from http://dist.lib.usu.edu/login?url=http://search.ebscohost.com/login.aspx?direct=true&db=aph&AN=9403110824&site=ehost-live

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