Heller, R. H. (1977). International trade: Theory and empirical evidence. Prentice Hall of India.
Chicago Stili AlıntıHeller, Robert H. International Trade: Theory and Empirical Evidence. New Delhi: Prentice Hall of India, 1977.
MLA AlıntıHeller, Robert H. International Trade: Theory and Empirical Evidence. Prentice Hall of India, 1977.
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