Bingham, R. C. (1987). Economic concepts: A programmed approach. New York: McGraw-Hill Book Company.
Trích dẫn kiểu ChicagoBingham, Robert C. Economic Concepts: A Programmed Approach. New York: McGraw-Hill Book Company, 1987.
Deismireacht MLABingham, Robert C. Economic Concepts: A Programmed Approach. New York: McGraw-Hill Book Company, 1987.
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