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“Direct Reciprocity: The Role of Repetition.” The Calculus of Selfishness: by Karl Sigmund, Princeton University Press, PRINCETON; OXFORD, 2010, pp. 49–81, Accessed 24 May 2020.
Sigmund, K. (2010). Direct Reciprocity: The Role of Repetition. In The Calculus of Selfishness: (pp. 49-81). PRINCETON; OXFORD: Princeton University Press. Retrieved May 24, 2020, from
Sigmund, Karl. "Direct Reciprocity: The Role of Repetition." In The Calculus of Selfishness:, 49-81. PRINCETON; OXFORD: Princeton University Press, 2010. Accessed May 24, 2020.

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