1. Alexa. Alexa Browse by Category. http://www.alexa.com/topsites/category/Top 2013. Alexa. Alexa Browse by Category. http://www.alexa.com/topsites/category/Top 2013.
2. Alexa. Alexa Top Websites. http://www.alexa.com/topsites 2013. Alexa. Alexa Top Websites. http://www.alexa.com/topsites 2013.
3. amada.abuse.ch. Malware Database (AMaDa) :: AMaDa Blocklist. http://amada.abuse.ch/blocklist.php?download=domainblocklist 2013. amada.abuse.ch. Malware Database (AMaDa) :: AMaDa Blocklist. http://amada.abuse.ch/blocklist.php?download=domainblocklist 2013.
4. Robust defenses for cross-site request forgery