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Dyfyniad Arddull ChicagoLandon, Megan. Environment, Health and Sustainable Development. Maidenhead : New Delhi: Open University Press ; Tata McGraw-Hill, 2006.
Dyfyniad MLALandon, Megan. Environment, Health and Sustainable Development. Open University Press ; Tata McGraw-Hill, 2006.
Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.