Skold, M. D., & Heady, E. O. (1966). Regional location of production of major field crops at alternative demand and price levels, 1975: A linear programing analysis. U.S. Dept. of Agriculture, Economic Research Service; for sale by the Supt. of Docs., U.S. Govt. Print. Off.
Παραπομπή σε μορφή Chicago (17η εκδ.)Skold, Melvin D., και Earl Orel Heady. Regional Location of Production of Major Field Crops at Alternative Demand and Price Levels, 1975: A Linear Programing Analysis. Washington: U.S. Dept. of Agriculture, Economic Research Service; for sale by the Supt. of Docs., U.S. Govt. Print. Off, 1966.
Παραπομπή σε μορφή MLA (9th εκδ.)Skold, Melvin D., και Earl Orel Heady. Regional Location of Production of Major Field Crops at Alternative Demand and Price Levels, 1975: A Linear Programing Analysis. U.S. Dept. of Agriculture, Economic Research Service; for sale by the Supt. of Docs., U.S. Govt. Print. Off, 1966.