Cita APA (7th ed.)

World Tourism Organization. (1983). Development of a system of statistical indicators for travel and tourism. The Organization.

Cita Chicago (17th ed.)

World Tourism Organization. Development of a System of Statistical Indicators for Travel and Tourism. Madrid: The Organization, 1983.

Cita MLA (9th ed.)

World Tourism Organization. Development of a System of Statistical Indicators for Travel and Tourism. The Organization, 1983.