Heathfield, D. F. (1987). An introduction to cost and production functions. New York: Macmillan.
Trích dẫn kiểu ChicagoHeathfield, David F. An Introduction to Cost and Production Functions. New York: Macmillan, 1987.
Deismireacht MLAHeathfield, David F. An Introduction to Cost and Production Functions. New York: Macmillan, 1987.
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