APA (7th ed.) Zitazioa
World Almanac Books. (2006). The world almanac and book of facts 2006. World Almanac Books.
Chicago Style (17th ed.) Zitazioa
World Almanac Books. The World Almanac and Book of Facts 2006. New York: World Almanac Books, 2006.
MLA (9th ed.) Zitazioa
World Almanac Books. The World Almanac and Book of Facts 2006. World Almanac Books, 2006.
Kontuz: berrikusi erreferentzia hauek erabili aurretik.