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Dyfyniad Arddull ChicagoThe Asian Waterfowl Census 1987-91: Distribution and Status of Asian Waterfowl. Gloucester, UK: International Waterfowl and Wetlands Research Bureau, 1994.
Dyfyniad MLAThe Asian Waterfowl Census 1987-91: Distribution and Status of Asian Waterfowl. Gloucester, UK: International Waterfowl and Wetlands Research Bureau, 1994.
Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.