Heller, H. (1977). International trade theory and empirical evidence/2nd ed. Prentice hall.
Dyfyniad Arddull ChicagoHeller, H.Robert. International Trade Theory and Empirical Evidence/2nd Ed. New Delhi: Prentice hall, 1977.
Dyfyniad MLAHeller, H.Robert. International Trade Theory and Empirical Evidence/2nd Ed. Prentice hall, 1977.
Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.