APA (7th ed.) Citation

Johnston, A. B., & Piscitello, D. M. (2006). Understanding Voice over IP security. Artech House.

Chicago Style (17th ed.) Citation

Johnston, Alan B., and David M. Piscitello. Understanding Voice over IP Security. Boston, MA: Artech House, 2006.

MLA (9th ed.) Citation

Johnston, Alan B., and David M. Piscitello. Understanding Voice over IP Security. Artech House, 2006.