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Dyfyniad Arddull ChicagoThe Environmental Regulatory Dictionary. Hoboken, N.J: Wiley & Sons, 2005.
Dyfyniad MLAThe Environmental Regulatory Dictionary. Hoboken, N.J: Wiley & Sons, 2005.
Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.