“The Harmonic Series.” Gamma: Exploring Euler's Constant, by Julian Havil and Freeman Dyson, Princeton University Press, PRINCETON; OXFORD, 2003, pp. 21–26, www.jstor.org/stable/j.ctt7sd75.7. Accessed 9 July 2020.
Havil, J., & Dyson, F. (2003). The Harmonic Series. In Gamma: Exploring Euler's Constant (pp. 21-26). PRINCETON; OXFORD: Princeton University Press. Retrieved July 9, 2020, from www.jstor.org/stable/j.ctt7sd75.7
Havil, Julian, and Freeman Dyson. "The Harmonic Series." In Gamma: Exploring Euler's Constant, 21-26. PRINCETON; OXFORD: Princeton University Press, 2003. Accessed July 9, 2020. www.jstor.org/stable/j.ctt7sd75.7.
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