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Dyfyniad Arddull ChicagoWelford, Richard. Corporate Environmental Management: Systems and Strategies. Hyderabad: Universities Press, 1999.
Dyfyniad MLAWelford, Richard. Corporate Environmental Management: Systems and Strategies. Universities Press, 1999.
Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.