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Dyfyniad Arddull ChicagoOfek, Haim. Second Nature: Economic Origins of Human Evolution. Cambridge, U.K: Cambridge University Press, 2001.
Dyfyniad MLAOfek, Haim. Second Nature: Economic Origins of Human Evolution. Cambridge, U.K: Cambridge University Press, 2001.
Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.