Roy, E. P. (1981). Economics: Applications to agriculture and agribusiness (3rd ed.). Danville, Ill: Interstate Printers & Publishers.
Chicago-tyylinen lähdeviittausRoy, Ewell P. Economics: Applications to Agriculture and Agribusiness. 3rd ed. Danville, Ill: Interstate Printers & Publishers, 1981.
MLA-viiteRoy, Ewell P. Economics: Applications to Agriculture and Agribusiness. 3rd ed. Danville, Ill: Interstate Printers & Publishers, 1981.
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