William A. Geering. (2002). Preparation of foot and mouth disease contingency plans. Rome, Italy: FAO.
Dyfyniad Arddull ChicagoWilliam A. Geering. Preparation of Foot and Mouth Disease Contingency Plans. Rome, Italy: FAO, 2002.
Dyfyniad MLAWilliam A. Geering. Preparation of Foot and Mouth Disease Contingency Plans. Rome, Italy: FAO, 2002.
Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.