APA (7th ed.) Zitazioa

Protevi. Life, War, Earth. University of Minnesota Press.

Chicago Style (17th ed.) Zitazioa

Protevi. Life, War, Earth. University of Minnesota Press.

MLA (9th ed.) Zitazioa

Protevi. Life, War, Earth. University of Minnesota Press.

Kontuz: berrikusi erreferentzia hauek erabili aurretik.