Goncalves, F. E. (2008). Building telephony systems with OpenSER: A step-by-step guide to building a high-performance telephony system. Packt.
Чикаго-гийн эшлэл (17 дахь хэвлэлт)Goncalves, Flavio E. Building Telephony Systems with OpenSER: A Step-by-step Guide to Building a High-performance Telephony System. Birmingham: Packt, 2008.
MLA -ийн эшлэл (9 дэх хэвлэлт)Goncalves, Flavio E. Building Telephony Systems with OpenSER: A Step-by-step Guide to Building a High-performance Telephony System. Packt, 2008.
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