1.		European tourism in 2012: trends & prospects / European Travel Commission Col.autor: European Travel Commission
2.		European Tourism in 2011: trends & prospects (Q4/2011) / European Travel Comission Data Publicação: 2012 Col.autor: European Travel Commission
3.		European tourism in 2012: trends & prospects / European Travel Commission Data Publicação: 2012 Col.autor: European Travel Commission