APA (7th ed.) Zitazioa
Sheckley, R. Untouched by Human Hands. Ballantine Books.
Chicago Style (17th ed.) Zitazioa
Sheckley, Robert. Untouched by Human Hands. Nueva York, EUA: Ballantine Books.
MLA (9th ed.) Zitazioa
Sheckley, Robert. Untouched by Human Hands. Ballantine Books.
Kontuz: berrikusi erreferentzia hauek erabili aurretik.