1.		Europe's senior travel market : including the proceedings of the 2nd european conference on the senior travel market, Malta, Nov. 1992 / European Travel Commission Data Publicação: 1993 Col.autor: ETC
2.		European Travel Conference: minutes of meeting of europeqan travel conference held in Brussels / European Travel Commission Data Publicação: 1965 Col.autor: ETC
3.		Minutes of the meeting held in Sweden House, Stockholm / European Travel Commission Data Publicação: 1969 Col.autor: ETC
4.		The Decision-making Process of Meetings, Congresses, Conventions and Incentives Organizers / OMT, ETC Data Publicação: 2015 Col.autor: OMT ETC