“Preface.” The Calculus of Selfishness: by Karl Sigmund, Princeton University Press, PRINCETON; OXFORD, 2010, pp. vii-x, www.jstor.org/stable/j.ctt7sw18.3. Accessed 13 July 2020.
Sigmund, K. (2010). Preface. In The Calculus of Selfishness: (pp. Vii-X). PRINCETON; OXFORD: Princeton University Press. Retrieved July 13, 2020, from www.jstor.org/stable/j.ctt7sw18.3
Sigmund, Karl. "Preface." In The Calculus of Selfishness:, Vii-X. PRINCETON; OXFORD: Princeton University Press, 2010. Accessed July 13, 2020. www.jstor.org/stable/j.ctt7sw18.3.
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