References: 1. WTO, Tourism after 11 September 2001: Analysis, Remedial Actions and Prospects Published november 2001. IsBN: 9284404894 2. WTO, Climate Change and Tourism, August 2003, ISBN: 9284406323References: 1. WTO, Tourism after 11 September 2001: Analysis, Remedial Actions and Prospects Published: November 2001, ISBN: 9284404894 2. WTO, Climate Change and Tourism, August 2003, ISBN: 9284406323