APA (7th ed.) Zitazioa
National Geographic Society. Enciclopedia de los Animales National Geographic. National Geographic Society.
Chicago Style (17th ed.) Zitazioa
National Geographic Society. Enciclopedia De Los Animales National Geographic. National Geographic Society.
MLA (9th ed.) Zitazioa
National Geographic Society. Enciclopedia De Los Animales National Geographic. National Geographic Society.
Kontuz: berrikusi erreferentzia hauek erabili aurretik.