APA (7th ed.) Citation

Johnston, A. B., & Piscitello, D. M. (2006). Understanding Voice Over IP Security.

Chicago Style (17th ed.) Citation

Johnston, Alan B., and David M. Piscitello. Understanding Voice Over IP Security. 2006.

MLA (9th ed.) Citation

Johnston, Alan B., and David M. Piscitello. Understanding Voice Over IP Security. 2006.

Warning: These citations may not always be 100% accurate.