| 1. | Portugal: travel & tourism: a world of opportunity: the 2003 travel & tourism economic research / WTTCData Publicação: 2003 Col.autor: World Travel & Tourism Council COTA(S): 9646; 9646-a |  | |
| 2. | Portugal: travel & tourism sowing the seeds of growth / World Travel & Tourism CouncilData Publicação: 2005 Col.autor: World Travel & Tourism Council COTA(S): 10394; 10394-a | | |
| 3. | Travel & tourism economic impact: Portugal / World Travel & Tourism CouncilData Publicação: 2010 Col.autor: World Travel & Tourism Council COTA(S): 12575 | | |
| 4. | Travel & tourism: economic impact 2012 - Portugal / World Travel & Tourism CouncilData Publicação: 2012 Col.autor: World Travel & Tourism Council COTA(S): 14080-Dg | | |