APA (7th ed.) Zitazioa

ebrary, Inc. (2000). Trade blocs. Oxford University Press.

Chicago Style (17th ed.) Zitazioa

ebrary, Inc. Trade Blocs. Oxford, England ; New York: Oxford University Press, 2000.

MLA (9th ed.) Zitazioa

ebrary, Inc. Trade Blocs. Oxford University Press, 2000.