APA (7e ed.) Bronvermelding

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

Chicago (17e ed.) Bronvermelding

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

MLA (8e ed.) Bronvermelding

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