Handbook on tourism product development / World Tourism Organization, European Travel Commission
COTA(S): 13935-Dg; 13935-A-Dg
Report 2011/2012: making a real social and economic contribution to Europe's economy / European Cruise Council
COTA(S): 14404
Tourism in the green economy / UNWTO
COTA(S): 14237; 14237-Dg