Παραπομπή APA
World Tourism Organization. (1996). What tourism managers need to know: A practical guide to the development and Use of indicators of sustainable tourism. Madrid: World Tourism Organization.
Παραπομπή Chicago StyleWorld Tourism Organization. What Tourism Managers Need to Know: A Practical Guide to the Development and Use of Indicators of Sustainable Tourism. Madrid: World Tourism Organization, 1996.
Παραπομπή MLAWorld Tourism Organization. What Tourism Managers Need to Know: A Practical Guide to the Development and Use of Indicators of Sustainable Tourism. Madrid: World Tourism Organization, 1996.
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