APA (7 वां संस्करण) प्रशस्ति पत्र
Goncalves, F. E. (2010). Building telephony systems with OpenSIPS 1.6: Build scalable and robust telephony systems using SIP. Packt Pub..
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्र
Goncalves, Flavio E. Building Telephony Systems with OpenSIPS 1.6: Build Scalable and Robust Telephony Systems Using SIP. Birmingham, U.K.: Packt Pub., 2010.
एमएलए (9वां संस्करण) प्रशस्ति पत्र
Goncalves, Flavio E. Building Telephony Systems with OpenSIPS 1.6: Build Scalable and Robust Telephony Systems Using SIP. Packt Pub., 2010.
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