APA (7th ed.) Zitazioa

Alley. The Two-Mile Time Machine. Princeton University Press.

Chicago Style (17th ed.) Zitazioa

Alley. The Two-Mile Time Machine. Princeton University Press.

MLA (9th ed.) Zitazioa

Alley. The Two-Mile Time Machine. Princeton University Press.

Kontuz: berrikusi erreferentzia hauek erabili aurretik.