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Dyfyniad Arddull ChicagoBehr, Marcel A., and Desmond M. Collins. Paratuberculosis: Organism, Disease, Control. UK: CAB International, 2010.
Dyfyniad MLABehr, Marcel A., and Desmond M. Collins. Paratuberculosis: Organism, Disease, Control. CAB International, 2010.
Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.