APA-čujuhus (7. p.)
Davidson, J., Peters, J., & Gracely, B. Voice over IP fundamentals. Cisco.
Chicago-čujuhus (17. p.)
Davidson, Jonathan, James Peters, juo Brian Gracely. Voice over IP Fundamentals. Indianápolis, EUA: Cisco.
MLA-čujuhus (9. p.)
Davidson, Jonathan, et al. Voice over IP Fundamentals. Cisco.
Muitte dárkkistit čujuhemiid riektatvuođa, ovdal go geavahat daid iežat deavsttas.