APA
Welch-Abernathy D. D., . (2004). Essential check point FireWall-1 NG : an installation, configuration, and troubleshooting guide. Boston, MA: Addison-Wesley.
Chicago
Welch-Abernathy Dameon D, . 2004. Essential check point FireWall-1 NG : an installation, configuration, and troubleshooting guide. Boston, MA: Addison-Wesley.
Harvard
Welch-Abernathy D. D., . (2004). Essential check point FireWall-1 NG : an installation, configuration, and troubleshooting guide. Boston, MA: Addison-Wesley.
MLA
Welch-Abernathy Dameon D, . Essential check point FireWall-1 NG : an installation, configuration, and troubleshooting guide. Boston, MA: Addison-Wesley. 2004.