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Arkin, Ofir. "The Use of Xprobe2 in a Corporate Environment." Black Hat 2003. http://www.blackhat.com/presentations/bh-federal-03/bh-fed-03-arkin.pdf
Nessus documentation. http://www.nessus.org/documentation/
Nmap Reference Guide. http:// insecure .org/nmap/man/
Nmap OS Identification. http://insecure.org/nmap/osdetect/
Port Scanner. http://en.wikipedia.org/wiki/Port_scanner