Cita APA (7th ed.)

Barnes, R., & Wolf, K. H. (2011). VoIP emergency calling: Foundations and practice. Wiley.

Cita Chicago (17th ed.)

Barnes, Richard, i Karl Heinz Wolf. VoIP Emergency Calling: Foundations and Practice. Hoboken, NJ: Wiley, 2011.

Cita MLA (9th ed.)

Barnes, Richard, i Karl Heinz Wolf. VoIP Emergency Calling: Foundations and Practice. Wiley, 2011.