1. The Travel and Tourism Competitiveness Report 2015http://reports.weforum.org/travel-and-tourism-competitiveness-report-2015/economy-rankings/
2. UNWTO/WWW2.unwto.org/About/Annual Report/UNWTO Annual Report 2015,2015
3. A Financial Conditions Index for the United States;Beaton,2009
4. Monitoring financial stability: A Financial Conditions Index approach, Federal Reserve Bank of Chicago;Brave;Econ. Perspect.,2011