Dyfyniad APA
Ritson, C. (1977). Agricultural economics: Principles and policy. St. Martin's Press.
Dyfyniad Arddull Chicago
Ritson, Christopher. Agricultural Economics: Principles and Policy. New York: St. Martin's Press, 1977.
Dyfyniad MLA
Ritson, Christopher. Agricultural Economics: Principles and Policy. St. Martin's Press, 1977.
Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.