Heller, H. R. (1977). International trade/2e: Theory and empirical evidence (2nd ed.). Prentice Hall of India.
Chicago Stili AlıntıHeller, H. Robert. International Trade/2e: Theory and Empirical Evidence. 2nd ed. New Delhi: Prentice Hall of India, 1977.
MLA AlıntıHeller, H. Robert. International Trade/2e: Theory and Empirical Evidence. 2nd ed. Prentice Hall of India, 1977.
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