Cita APA (7th ed.)

Swale, R., & Collins, D. (2014). Carrier-grade VoIP (Third edition.). McGraw-Hill.

Cita Chicago (17th ed.)

Swale, Richard, i Daniel Collins. Carrier-grade VoIP. Third edition. New York: McGraw-Hill, 2014.

Cita MLA (9th ed.)

Swale, Richard, i Daniel Collins. Carrier-grade VoIP. Third edition. McGraw-Hill, 2014.