Carr, H. H., & Snyder, C. A. (2007). Data communications and network security. McGraw-Hill Irwin.

Carr, Houston H., and Charles A. Snyder. Data Communications and Network Security. New York, NY: McGraw-Hill Irwin, 2007.

Carr, Houston H., and Charles A. Snyder. Data Communications and Network Security. McGraw-Hill Irwin, 2007.