International Union of Official Travel Organizations. Guidelines for the collection and presentation of international travel statistics. World Tourism Organization.
Chicago Style (17th ed.) CitationInternational Union of Official Travel Organizations. Guidelines for the Collection and Presentation of International Travel Statistics. Madrid: World Tourism Organization.
MLA (9th ed.) CitationInternational Union of Official Travel Organizations. Guidelines for the Collection and Presentation of International Travel Statistics. World Tourism Organization.
Warning: These citations may not always be 100% accurate.