APA-čujuhus (7. p.)
Helpman, E. (2011). Understanding global trade. Belknap Press of Harvard University Press.
Chicago-čujuhus (17. p.)
Helpman, Elhanan. Understanding Global Trade. Cambridge, Mass.: Belknap Press of Harvard University Press, 2011.
MLA-čujuhus (9. p.)
Helpman, Elhanan. Understanding Global Trade. Belknap Press of Harvard University Press, 2011.
Muitte dárkkistit čujuhemiid riektatvuođa, ovdal go geavahat daid iežat deavsttas.