World Tourism Organization. (1983). Development of a system of statistical indicators for travel and tourism. The Organization.
Citação do estilo Chicago (17ª ed.)World Tourism Organization. Development of a System of Statistical Indicators for Travel and Tourism. Madrid: The Organization, 1983.
Citação MLA (9ª ed.)World Tourism Organization. Development of a System of Statistical Indicators for Travel and Tourism. The Organization, 1983.
Nota: a formatação da citação pode não corresponder 100% ao definido pela respectiva norma.