Hersent, O., Gurle, D., & Petit, J. (2000). IP telephony: Packet-based multimedia communications systems. Pearson Education.
Chicago-čujuhus (17. p.)Hersent, Olivier, David Gurle, juo Jean-Pierre Petit. IP Telephony: Packet-based Multimedia Communications Systems. Essex: Pearson Education, 2000.
MLA-čujuhus (9. p.)Hersent, Olivier, et al. IP Telephony: Packet-based Multimedia Communications Systems. Pearson Education, 2000.
Muitte dárkkistit čujuhemiid riektatvuođa, ovdal go geavahat daid iežat deavsttas.