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Dyfyniad Arddull ChicagoCapra, Fritjof. The Hidden Connections: A Science for Sustainable Living. London: Flamingo, 2002.
Dyfyniad MLACapra, Fritjof. The Hidden Connections: A Science for Sustainable Living. Flamingo, 2002.
Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.