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Dyfyniad Arddull ChicagoJenner, Paul, and Christine Smith. The Environmental Business Handbook. London: Euromonitor, 1989.
Dyfyniad MLAJenner, Paul, and Christine Smith. The Environmental Business Handbook. Euromonitor, 1989.
Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.