Cita APA (7th ed.)

Bellamy, J. (2003). Digital telephony (3rd ed.). Wiley.

Cita Chicago (17th ed.)

Bellamy, John. Digital Telephony. 3rd ed. New York ; Singapore: Wiley, 2003.

Cita MLA (8th ed.)

Bellamy, John. Digital Telephony. 3rd ed. Wiley, 2003.