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Dyfyniad Arddull ChicagoGlasson, John Therivel. Introduction to Environmental Impact Assessment: The Natural and Built Environment Series. Second. London: UCL, 1999.
Dyfyniad MLAGlasson, John Therivel. Introduction to Environmental Impact Assessment: The Natural and Built Environment Series. Second. UCL, 1999.
Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.