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Dyfyniad Arddull ChicagoDasgupta,Partha. Human Well-being and the Natural Environment. NA. New Delhi: Oxford, 2001.
Dyfyniad MLADasgupta,Partha. Human Well-being and the Natural Environment. NA. Oxford, 2001.
Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.