World Tourism Organization This link opens in a new windowThis database contains UNWTO publications such as books, journals, and statistics in their respective languages. In addition to more than 900 books in English, French, Spanish, Russian or Arabic, the e-unwto also provides access to a growing number of documents which can be defined as "Gray Literature." The latest statistical information and aggregated data on inbound and outbound tourism are very conveniently presented within the "Tourism Factbook."