Παραπομπή APA
World Tourism Organization. (2002). The Impact of the September 11th attacks on tourism: The light at the end of the tunnel (April 2002). Madrid: World Tourism Organization.
Παραπομπή Chicago StyleWorld Tourism Organization. The Impact of the September 11th Attacks On Tourism: The Light At the End of the Tunnel (April 2002). Madrid: World Tourism Organization, 2002.
Παραπομπή MLAWorld Tourism Organization. The Impact of the September 11th Attacks On Tourism: The Light At the End of the Tunnel (April 2002). Madrid: World Tourism Organization, 2002.
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