APA (7th ed.) Zitazioa
Organisation for Economic Co-operation and Development. (1991). United States: 1990/1991. OECD Publishing.
Chicago Style (17th ed.) Zitazioa
Organisation for Economic Co-operation and Development. United States: 1990/1991. Paris: OECD Publishing, 1991.
MLA (9th ed.) Zitazioa
Organisation for Economic Co-operation and Development. United States: 1990/1991. OECD Publishing, 1991.
Kontuz: berrikusi erreferentzia hauek erabili aurretik.