^Roberts, H., Zuckerman, E., & Palfrey, J. (2009, March). 2007 Circumvention Landscape Report: Methods, Uses, and Tools (Rep.). Retrieved March 18, 2016, from The Berkman Center for Internet & Society at Harvard University.
^"Risks", Internet censorship wiki. Retrieved 2 September 2011
^ abDue to legal concerns the OpenNet Initiative does not check for filtering of child pornography and because their classifications focus on technical filtering, they do not include other types of censorship.
^ ab"Internet Enemies", Enemies of the Internet 2014: Entities at the heart of censorship and surveillance, Reporters Without Borders (Paris), 11 March 2014. Retrieved 24 June 2014.
^"Introduction"(PDF). Archived from the original on 29 June 2012. Retrieved 14 September 2011.CS1 maint: BOT: original-url status unknown (Archived 26 February 2009 at the Wayback Machine, Ronald Deibert, John Palfrey, Rafal Rohozinski, and Jonathan Zittrain, eds., MIT Press (Cambridge), 2008