Cita APA (7th ed.)
Helpman, E. (2011). Understanding global trade. Belknap Press of Harvard University Press.
Cita Chicago (17th ed.)
Helpman, Elhanan. Understanding Global Trade. Cambridge, Mass.: Belknap Press of Harvard University Press, 2011.
Cita MLA (9th ed.)
Helpman, Elhanan. Understanding Global Trade. Belknap Press of Harvard University Press, 2011.
Atenció: Aquestes cites poden no estar 100% correctes.