Davies, M. I. (1968). Points from Letters: Foot-and-mouth Disease.
Dyfyniad Arddull ChicagoDavies, M. I. Points From Letters: Foot-and-mouth Disease. 1968.
Dyfyniad MLADavies, M. I. Points From Letters: Foot-and-mouth Disease. 1968.
Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.