APA (7th ed.) Zitazioa

Steinbock. The Fourfold. Northwestern University Press.

Chicago Style (17th ed.) Zitazioa

Steinbock. The Fourfold. Northwestern University Press.

MLA (9th ed.) Zitazioa

Steinbock. The Fourfold. Northwestern University Press.

Kontuz: berrikusi erreferentzia hauek erabili aurretik.