World Tourism Organization. (1983). Development of a system of statistical indicators for travel and tourism. The Organization.
Цитирование в стиле Чикаго (17-е изд.)World Tourism Organization. Development of a System of Statistical Indicators for Travel and Tourism. Madrid: The Organization, 1983.
Цитирование MLA (9-е изд.)World Tourism Organization. Development of a System of Statistical Indicators for Travel and Tourism. The Organization, 1983.
Предупреждение: эти цитированмия не могут быть всегда правильны на 100%.