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Dyfyniad Arddull ChicagoSingh,Chanchal. Global Warming and Climatology. New Delhi, India: Akansha Pub. House, 2007.
Dyfyniad MLASingh,Chanchal. Global Warming and Climatology. Akansha Pub. House, 2007.
Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.