Cita APA (7th ed.)

Held, G. (2002). Understanding data communications (7th ed.). Addison-Wesley, ; Pearson Education.

Cita Chicago (17th ed.)

Held, Gilbert. Understanding Data Communications. 7th ed. Boston : New Delhi: Addison-Wesley, ; Pearson Education, 2002.

Cita MLA (8th ed.)

Held, Gilbert. Understanding Data Communications. 7th ed. Addison-Wesley, ; Pearson Education, 2002.