6Copyright Industries in the U.S. Economy: The 2011 Report, by Stephen E. Siwek of Economists Incorporated, prepared for the International Intellectual Property Alliance (IIPA) released on November 2, 2011.
7NCTA,“Industry Data”,2012年4月16日查阅.
8BBC," BBC Worldwide Annual Review 2010 - 2011 ",July 12,2011.