Jennifer Blanke and Thea Chiesa, Editors, The Travel & Tourism Competitiveness Report 2007 (PDF), su weforum.org, World Economic Forum, Geneva, Switzerland, 2007. URL consultato il 4 marzo 2009.
Jennifer Blanke and Thea Chiesa, Editors, Travel & Tourism Competitiveness Report 2008 (PDF), su weforum.org, World Economic Forum, Geneva, Switzerland, 2008. URL consultato il 4 marzo 2009.
Jennifer Blanke and Thea Chiesa, Editors, Travel & Tourism Competitiveness Report 2009, su weforum.org, World Economic Forum, Geneva, Switzerland, 2009. URL consultato il 4 marzo 2009.