World Tourism Organization (WTO). (2015). Tourism at world heritage sites: Challenges and opportunities : international tourism seminar, Cesmse (Izmir), Turkey, 26 March 2013. World Tourism Organization.
Παραπομπή σε μορφή Chicago (17η εκδ.)World Tourism Organization (WTO). Tourism at World Heritage Sites: Challenges and Opportunities : International Tourism Seminar, Cesmse (Izmir), Turkey, 26 March 2013. Madrid: World Tourism Organization, 2015.
Παραπομπή σε μορφή MLA (9th εκδ.)World Tourism Organization (WTO). Tourism at World Heritage Sites: Challenges and Opportunities : International Tourism Seminar, Cesmse (Izmir), Turkey, 26 March 2013. World Tourism Organization, 2015.
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