World Tourism Organization. (1993). Tourism to the year 2000: Qualitative aspects affecting global growth : a discussion paper, executive summary. World Tourism Organization.
Цитирование в стиле Чикаго (17-е изд.)World Tourism Organization. Tourism to the Year 2000: Qualitative Aspects Affecting Global Growth : A Discussion Paper, Executive Summary. Madrid, Spain: World Tourism Organization, 1993.
Цитирование MLA (9-е изд.)World Tourism Organization. Tourism to the Year 2000: Qualitative Aspects Affecting Global Growth : A Discussion Paper, Executive Summary. World Tourism Organization, 1993.
Предупреждение: эти цитированмия не могут быть всегда правильны на 100%.