World Tourism Organization. Tourism: 2020 vision: executive summary. 2nd rev. and updated ed. Madrid: World Tourism Organization, 1998. 48 s.
(1998). Tourism: 2020 vision: Executive summary (2nd rev. and updated ed.). Madrid: World Tourism Organization.
Styl ChicagoTourism: 2020 Vision: Executive Summary. 2nd rev. and updated ed. Madrid: World Tourism Organization, 1998.
Citace podle MLATourism: 2020 Vision: Executive Summary. 2nd rev. and updated ed. Madrid: World Tourism Organization, 1998.
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