Cita APA (7th ed.)

Bellamy, J. (1991). Digital telephony (2nd ed.). John Wiley.

Cita Chicago (17th ed.)

Bellamy, John. Digital Telephony. 2nd ed. New York: John Wiley, 1991.

Cita MLA (9th ed.)

Bellamy, John. Digital Telephony. 2nd ed. John Wiley, 1991.