APA (7th ed.) Zitazioa

(1990). World Almanac: And book of facts. World Almanac.

Chicago Style (17th ed.) Zitazioa

World Almanac: And Book of Facts. New york: World Almanac, 1990.

MLA (9th ed.) Zitazioa

World Almanac: And Book of Facts. World Almanac, 1990.

Kontuz: berrikusi erreferentzia hauek erabili aurretik.