Cita APA (7th ed.)

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

Cita Chicago (17th ed.)

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

Cita MLA (9th ed.)

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