Dyfyniad APA

Grossman, G. M., & Helpman, E. (2002). Interest groups and trade policy. Princeton University Press.

Dyfyniad Arddull Chicago

Grossman, Gene M., and Elhanan Helpman. Interest Groups and Trade Policy. Princeton, N.J: Princeton University Press, 2002.

Dyfyniad MLA

Grossman, Gene M., and Elhanan Helpman. Interest Groups and Trade Policy. Princeton University Press, 2002.

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