APA (7th ed.) Zitazioa
(2009). The world almanac and book of facts, 2009. World Almanac Books.
Chicago Style (17th ed.) Zitazioa
The World Almanac and Book of Facts, 2009. New York: World Almanac Books, 2009.
MLA (9th ed.) Zitazioa
The World Almanac and Book of Facts, 2009. World Almanac Books, 2009.
Kontuz: berrikusi erreferentzia hauek erabili aurretik.