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Dyfyniad Arddull ChicagoThomas A Jefferson. FAO Species Identification Guide: Marine Mammals of the World. Rome: FAO, 1993.
Dyfyniad MLAThomas A Jefferson. FAO Species Identification Guide: Marine Mammals of the World. Rome: FAO, 1993.
Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.