Gaya APA

Organization, W, T. (2004). Indicators of Sustainable Development for Tourism Destinations : A Guidebook (hanya tersedia file pdf) . Spanyol: World Tourism Organization.

Gaya MLA

Organization, World, Tourism. "Indicators of Sustainable Development for Tourism Destinations : A Guidebook (hanya tersedia file pdf)". Spanyol: World Tourism Organization, 2004. Text.