Barnard, C. (1979). Farm planning and control (2nd.ed.). Cambridge Univ..
Dyfyniad Arddull ChicagoBarnard, C.S. Farm Planning and Control. 2nd.ed. Cambridge: Cambridge Univ., 1979.
Dyfyniad MLABarnard, C.S. Farm Planning and Control. 2nd.ed. Cambridge Univ., 1979.
Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.