Links
[1] http://www.economist.com/
[2] https://edesiderata.crl.edu/providers/economist-intelligence-unit
[3] http://www.eiu.com/home.aspx
[4] http://gdc.gale.com/products/the-economist-historical-archive-1843-2007/
[5] http://www.economist.com/legal/terms-of-use#changes
[6] http://www.pcmag.com/article2/0,2817,2373292,00.asp