World Tourism Organization. (2001). Sustainable development of ecotourism: A compilation of good practices = Desarrollo sostenible del ecoturismo : una compilacion de buenas practicas = Developpment durable de l' ecotourisme : une compilation de bonnes pratiques. World Tourism Organization.
Παραπομπή σε μορφή Chicago (17η εκδ.)World Tourism Organization. Sustainable Development of Ecotourism: A Compilation of Good Practices = Desarrollo Sostenible Del Ecoturismo : Una Compilacion De Buenas Practicas = Developpment Durable De L' Ecotourisme : Une Compilation De Bonnes Pratiques. [Madrid]: World Tourism Organization, 2001.
Παραπομπή σε μορφή MLA (8th εκδ.)World Tourism Organization. Sustainable Development of Ecotourism: A Compilation of Good Practices = Desarrollo Sostenible Del Ecoturismo : Una Compilacion De Buenas Practicas = Developpment Durable De L' Ecotourisme : Une Compilation De Bonnes Pratiques. World Tourism Organization, 2001.
