Cita APA (7a ed.)

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

Cita Chicago Style (17a ed.)

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

Cita MLA (9a ed.)

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