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Dyfyniad Arddull ChicagoChapman, Keith. The International Petrochemical Industry: Evolution and Location. Oxford, UK ; Cambridge, Mass., USA: B. Blackwell, 1991.
Dyfyniad MLAChapman, Keith. The International Petrochemical Industry: Evolution and Location. B. Blackwell, 1991.
Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.