Cita APA (7th ed.)

Bellamy, J. (2001). Digital telephony (2nd ed.). John Wiley & Sons, INC..

Cita Chicago (17th ed.)

Bellamy, John. Digital Telephony. 2nd ed. New York: John Wiley & Sons, INC., 2001.

Cita MLA (9th ed.)

Bellamy, John. Digital Telephony. 2nd ed. John Wiley & Sons, INC., 2001.