APA-viite

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

Chicago-tyylinen lähdeviittaus

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

MLA-viite

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