“Front Matter.” The Calculus of Selfishness: by Karl Sigmund, Princeton University Press, PRINCETON; OXFORD, 2010, pp. i-iv, www.jstor.org/stable/j.ctt7sw18.1. Accessed 23 Nov. 2020.
Sigmund, K. (2010). Front Matter. In The Calculus of Selfishness: (pp. I-Iv). PRINCETON; OXFORD: Princeton University Press. Retrieved November 23, 2020, from http://www.jstor.org/stable/j.ctt7sw18.1
Sigmund, Karl. "Front Matter." In The Calculus of Selfishness:, I-Iv. PRINCETON; OXFORD: Princeton University Press, 2010. Accessed November 23, 2020. http://www.jstor.org/stable/j.ctt7sw18.1.
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