“Introduction.” Gamma: Exploring Euler's Constant, by Julian Havil and Freeman Dyson, Princeton University Press, PRINCETON; OXFORD, 2003, pp. xix-xxiv, www.jstor.org/stable/j.ctt7sd75.5. Accessed 4 July 2020.
Havil, J., & Dyson, F. (2003). Introduction. In Gamma: Exploring Euler's Constant (pp. Xix-Xxiv). PRINCETON; OXFORD: Princeton University Press. Retrieved July 4, 2020, from www.jstor.org/stable/j.ctt7sd75.5
Havil, Julian, and Freeman Dyson. "Introduction." In Gamma: Exploring Euler's Constant, Xix-xiv. PRINCETON; OXFORD: Princeton University Press, 2003. Accessed July 4, 2020. www.jstor.org/stable/j.ctt7sd75.5.
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