Cita APA (7th ed.)

Goncalves, F. E. (2008). Building telephony systems with OpenSER: A step-by-step guide to building a high-performance telephony system. Packt.

Cita Chicago (17th ed.)

Goncalves, Flavio E. Building Telephony Systems with OpenSER: A Step-by-step Guide to Building a High-performance Telephony System. Birmingham: Packt, 2008.

Cita MLA (9th ed.)

Goncalves, Flavio E. Building Telephony Systems with OpenSER: A Step-by-step Guide to Building a High-performance Telephony System. Packt, 2008.