Bellamy, J. (1982). Digital telephony. Wiley-Interscience.
Cita Chicago (17th ed.)Bellamy, John. Digital Telephony. New York: Wiley-Interscience, 1982.
Cita MLA (9th ed.)Bellamy, John. Digital Telephony. Wiley-Interscience, 1982.
Atenció: Aquestes cites poden no estar 100% correctes.