APA (7th ed.) Citation

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

Chicago Style (17th ed.) Citation

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

MLA (9th ed.) Citation

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