APA (7th ed.) Zitazioa
Silverberg, R. The Second Trip. Signet : New American Library.
Chicago Style (17th ed.) Zitazioa
Silverberg, Robert. The Second Trip. Nueva York, EUA: Signet : New American Library.
MLA (9th ed.) Zitazioa
Silverberg, Robert. The Second Trip. Signet : New American Library.
Kontuz: berrikusi erreferentzia hauek erabili aurretik.