Cita APA (7th ed.)

Bellamy John. (1991). Digital Telephony (2nd ed.). Wiley.

Cita Chicago (17th ed.)

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

Cita MLA (9th ed.)

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