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 Style

World 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 MLA

World 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.

Πρόσοχή: Οι παραπομπές μπορεί να μην είναι 100% ακριβείς.