Dyfyniad APA

Sabin, P. (2013). The bet: Paul Ehrlich, Julian Simon, and our gamble over Earth's future. Yale University Press.

Dyfyniad Arddull Chicago

Sabin, Paul. The Bet: Paul Ehrlich, Julian Simon, and Our Gamble over Earth's Future. New Haven: Yale University Press, 2013.

Dyfyniad MLA

Sabin, Paul. The Bet: Paul Ehrlich, Julian Simon, and Our Gamble over Earth's Future. Yale University Press, 2013.

Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.