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Dyfyniad Arddull ChicagoWeiner, Jonathan. The Next One Hundred Years: Shaping the Fate of Our Living Earth. London: Rider, 1990.
Dyfyniad MLAWeiner, Jonathan. The Next One Hundred Years: Shaping the Fate of Our Living Earth. Rider, 1990.
Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.