1.		Demographic Change and tourism / World Tourism Organization; European Travel Commission Data Publicação: 2010 Col.autor: OMT ETC
2.		European tourism in 2013: Trends & Prospects : Quarterly Report (Q1/2013) / ETC-European Travel Commission Data Publicação: 2013 Col.autor: ETC
3.		The Chinese outbound travel market / OMT, ETC Data Publicação: 2012 Col.autor: OMT ETC
4.		European Travel Conference: minutes of meeting of europeqan travel conference held in Brussels / European Travel Commission Data Publicação: 1965 Col.autor: ETC