Vousden, N. (1990). The economics of trade protection. Cambridge University Press.
Chicago Style aipamenaVousden, Neil. The Economics of Trade Protection. Cambridge ; New York: Cambridge University Press, 1990.
MLA aipamenaVousden, Neil. The Economics of Trade Protection. Cambridge University Press, 1990.
Kontuz: berrikusi erreferentzia hauek erabili aurretik.