एपीए उद्धरण

Helpman,Elhanan. (1978). A theory of international trade under uncertainty. Academic Press.

शिकागो स्टाइल उद्धरण

Helpman,Elhanan. A Theory of International Trade Under Uncertainty. New York: Academic Press, 1978.

एमएलए उद्धरण

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