APA (7th ed.) Zitazioa

(2003). Discover science almanac: The definitive science resource. Hyperion.

Chicago Style (17th ed.) Zitazioa

Discover Science Almanac: The Definitive Science Resource. New York: Hyperion, 2003.

MLA (9th ed.) Zitazioa

Discover Science Almanac: The Definitive Science Resource. Hyperion, 2003.