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Dyfyniad Arddull ChicagoPretty, Jules. The Earth Only Endures: On Reconnecting with Nature and Our Place in It. London: Earthscan, 2007.
Dyfyniad MLAPretty, Jules. The Earth Only Endures: On Reconnecting with Nature and Our Place in It. Earthscan, 2007.
Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.