Sengupta, N. (2007). Economics of trade facilitation. Oxford University Press.
Chicago Style aipamenaSengupta, Nirmal. Economics of Trade Facilitation. New Delhi: Oxford University Press, 2007.
MLA aipamenaSengupta, Nirmal. Economics of Trade Facilitation. Oxford University Press, 2007.
Kontuz: berrikusi erreferentzia hauek erabili aurretik.