Dyfyniad APA

Helpman, E. (1978). A Theory of International Trade Under Uncertainty. ELSEVIER.

Dyfyniad Arddull Chicago

Helpman, Elhanan. A Theory of International Trade Under Uncertainty. ELSEVIER, 1978.

Dyfyniad MLA

Helpman, Elhanan. A Theory of International Trade Under Uncertainty. ELSEVIER, 1978.

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