1. Internet World Stats. Internet Growth Statistics,
http://www.internetworldstats.com/emarketing.html
2. The Internet Economist. The Internet Economy 25 years After.com,
http://www.itif.org/files/2010-25-years.pdf
3. Symantec. Internet Security Threat Report-Volume XV,
http://eval.symantec.com/mktginfo/enterprise/white_papers/b-whitepaper_internet_security_threat_report_xv_04-2010.en-us.pdf
4. Cisco. Cisco 2010 Annual Security Report,
http://www.cisco.com/en/US/prod/collateral/vpndevc/security_annual_report_2010.pdf
5. Symantec. Symantec’s monthly state of spam report (October 2008),
http://eval.symantec.com/mktginfo/enterprise/other_resources/b-state_of_spam_report_10-2008.en-us.pdf