Bellamy, J. (2001). Digital telephony (2nd ed.). John Wiley & Sons, INC..
Chicago-čujuhus (17. p.)Bellamy, John. Digital Telephony. 2nd ed. New York: John Wiley & Sons, INC., 2001.
MLA-čujuhus (9. p.)Bellamy, John. Digital Telephony. 2nd ed. John Wiley & Sons, INC., 2001.
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