Cita APA (7th ed.)
Bellamy, J. C. (2000). Digital telephony (3rd ed.). Wiley.
Cita Chicago (17th ed.)
Bellamy, John C. Digital Telephony. 3rd ed. New Delhi: Wiley, 2000.
Cita MLA (9th ed.)
Bellamy, John C. Digital Telephony. 3rd ed. Wiley, 2000.
Atenció: Aquestes cites poden no estar 100% correctes.