Bellamy, J. (1991). Digital telephony (2nd ed.). John Wiley.
Chicago-čujuhus (17. p.)Bellamy, John. Digital Telephony. 2nd ed. New York: John Wiley, 1991.
MLA-čujuhus (9. p.)Bellamy, John. Digital Telephony. 2nd ed. John Wiley, 1991.
Muitte dárkkistit čujuhemiid riektatvuođa, ovdal go geavahat daid iežat deavsttas.