Παραπομπή APA

Held, G. (2003). Understanding data communications (7th ed.). Pearson Education.

Παραπομπή Chicago Style

Held, Gilbert. Understanding Data Communications. 7th ed. Delhi: Pearson Education, 2003.

Παραπομπή MLA

Held, Gilbert. Understanding Data Communications. 7th ed. Pearson Education, 2003.