APA引文
Helpman, E. (2011). Understanding global trade. Belknap Press of Harvard University Press.
Chicago Style (17th ed.) Citation
Helpman, Elhanan. Understanding Global Trade. Cambridge, Mass.: Belknap Press of Harvard University Press, 2011.
MLA引文
Helpman, Elhanan. Understanding Global Trade. Belknap Press of Harvard University Press, 2011.
警告：這些引文格式不一定是100％准確.