APA (7th ed.) Citation

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

Chicago Style (17th ed.) Citation

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

MLA (9th ed.) Citation

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

Warning: These citations may not always be 100% accurate.