APA (7th ed.) Zitazioa
Held, G. (2002). Understanding data communications (7th ed.). Addison-Wesley.
Chicago Style (17th ed.) Zitazioa
Held, Gilbert. Understanding Data Communications. 7th ed. New Delhi : Dorling Kindersley : Boston: Addison-Wesley, 2002.
MLA (9th ed.) Zitazioa
Held, Gilbert. Understanding Data Communications. 7th ed. Addison-Wesley, 2002.
Kontuz: berrikusi erreferentzia hauek erabili aurretik.