APA (7th ed.) Zitazioa
(2003). Agriculture, trade and the environment: The pig sector. OECD.
Chicago Style (17th ed.) Zitazioa
Agriculture, Trade and the Environment: The Pig Sector. Paris, Cedex, France: OECD, 2003.
MLA (9th ed.) Zitazioa
Agriculture, Trade and the Environment: The Pig Sector. OECD, 2003.
Kontuz: berrikusi erreferentzia hauek erabili aurretik.