APA-referens (7:e uppl.)

Held, G. (1996). Understanding Data communications (4th.). P H I.

Chicago-referens (17:e uppl.)

Held, Gilbert. Understanding Data Communications. 4th. New Delhi: P H I, 1996.

MLA-referens (9:e uppl.)

Held, Gilbert. Understanding Data Communications. 4th. P H I, 1996.