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