Cita APA (7th ed.)
Held, G. (2002). Understanding data communications (7th ed.). Addison-Wesley.
Cita Chicago (17th ed.)
Held, Gilbert. Understanding Data Communications. 7th ed. New Delhi : Dorling Kindersley : Boston: Addison-Wesley, 2002.
Cita MLA (9th ed.)
Held, Gilbert. Understanding Data Communications. 7th ed. Addison-Wesley, 2002.
Atenció: Aquestes cites poden no estar 100% correctes.