Epp, D. J. (1981). Introduction to agricultural economics. New York: Collier Macmillan.
Trích dẫn kiểu ChicagoEpp, Donald J. Introduction to Agricultural Economics. New York: Collier Macmillan, 1981.
Deismireacht MLAEpp, Donald J. Introduction to Agricultural Economics. New York: Collier Macmillan, 1981.
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