APA-viite (7. p.)
Goncalves, F. E. (2008). Building telephony systems with OpenSER: A step-by-step guide to building a high-performance telephony system. Packt.
Chicago-viite (17. p.)
Goncalves, Flavio E. Building Telephony Systems with OpenSER: A Step-by-step Guide to Building a High-performance Telephony System. Birmingham: Packt, 2008.
MLA-viite (9. p.)
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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