Ritson, C. (1977). Agricultural economics: Principles and Policy. Cros by Lockwood staples.
Dyfyniad Arddull ChicagoRitson, Christopher. Agricultural Economics: Principles and Policy. London: Cros by Lockwood staples, 1977.
Dyfyniad MLARitson, Christopher. Agricultural Economics: Principles and Policy. Cros by Lockwood staples, 1977.
Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.