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Dyfyniad Arddull ChicagoGilpin, Alan. Environmental Impact Assessment (EIA): Cutting Edge for the Twenty-first Century. Cambridge, New York: Cambridge University Press, 1995.
Dyfyniad MLAGilpin, Alan. Environmental Impact Assessment (EIA): Cutting Edge for the Twenty-first Century. Cambridge University Press, 1995.
Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.