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Dyfyniad Arddull ChicagoThe en. The En: Eloping Countries Stakes,ironment and International Trade Negotiations: De. Ottawwa, Canada: IDRC, 1999.
Dyfyniad MLAThe en. The En: Eloping Countries Stakes,ironment and International Trade Negotiations: De. Ottawwa, Canada: IDRC, 1999.
Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.