APA (7th ed.) Citation

World Tourism Organization & United Nations Environment Programme. Terrestrial Ecosystems Branch. Industry and Environment Programme Activity Centre. (1992). Guidelines: Development of national parks and protected areas for tourism. IUCN.

Chicago Style (17th ed.) Citation

World Tourism Organization and United Nations Environment Programme. Terrestrial Ecosystems Branch. Industry and Environment Programme Activity Centre. Guidelines: Development of National Parks and Protected Areas for Tourism. Madrid: IUCN, 1992.

MLA (9th ed.) Citation

World Tourism Organization and United Nations Environment Programme. Terrestrial Ecosystems Branch. Industry and Environment Programme Activity Centre. Guidelines: Development of National Parks and Protected Areas for Tourism. IUCN, 1992.