APA (7th ed.) Zitazioa
Barrett, S. (2007). Why cooperate?: The incentive to supply global public goods. Oxford University Press.
Chicago Style (17th ed.) Zitazioa
Barrett, Scott. Why Cooperate?: The Incentive to Supply Global Public Goods. Oxford ; New York: Oxford University Press, 2007.
MLA (9th ed.) Zitazioa
Barrett, Scott. Why Cooperate?: The Incentive to Supply Global Public Goods. Oxford University Press, 2007.
Kontuz: berrikusi erreferentzia hauek erabili aurretik.