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MLA
“Public Goods and Joint Efforts: Between Freedom and Enforcement.” The Calculus of Selfishness: by Karl Sigmund, Princeton University Press, PRINCETON; OXFORD, 2010, pp. 123–144, www.jstor.org/stable/j.ctt7sw18.9. Accessed 2 Dec. 2020.
APA
Sigmund, K. (2010). Public Goods and Joint Efforts: Between Freedom and Enforcement. In The Calculus of Selfishness: (pp. 123-144). PRINCETON; OXFORD: Princeton University Press. Retrieved December 2, 2020, from http://www.jstor.org/stable/j.ctt7sw18.9
CHICAGO
Sigmund, Karl. "Public Goods and Joint Efforts: Between Freedom and Enforcement." In The Calculus of Selfishness:, 123-44. PRINCETON; OXFORD: Princeton University Press, 2010. Accessed December 2, 2020. http://www.jstor.org/stable/j.ctt7sw18.9.

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