Hersent, O., Gurle, D., & Petit, J. (2000). IP telephony: Packet-based multimedia communications systems. Pearson Education.
Čikaški stil citiranja (17. izdanje)Hersent, Olivier, David Gurle, i Jean-Pierre Petit. IP Telephony: Packet-based Multimedia Communications Systems. Essex: Pearson Education, 2000.
MLA način citiranja (9. izdanje)Hersent, Olivier, et al. IP Telephony: Packet-based Multimedia Communications Systems. Pearson Education, 2000.
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