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Dyfyniad Arddull ChicagoFox, M W. Behaviour of Wolves, Dogs and Related Canids. Jonathan Cape, London, 1971.
Dyfyniad MLAFox, M W. Behaviour of Wolves, Dogs and Related Canids. 1971.
Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.