“Some Interesting Formulas Involving e.” "e": The Story of a Number, by Eli Maor, Princeton University Press, PRINCETON; OXFORD, 1994, pp. 151–152, www.jstor.org/stable/j.ctt7t8q5.25. Accessed 9 July 2020.
Maor, E. (1994). Some Interesting Formulas Involving e. In "e": The Story of a Number (pp. 151-152). PRINCETON; OXFORD: Princeton University Press. Retrieved July 9, 2020, from www.jstor.org/stable/j.ctt7t8q5.25
Maor, Eli. "Some Interesting Formulas Involving E." In "e": The Story of a Number, 151-52. PRINCETON; OXFORD: Princeton University Press, 1994. Accessed July 9, 2020. www.jstor.org/stable/j.ctt7t8q5.25.
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