1. | | Data Publicação: [199?] Col.autor: HOTREC-Confederation of the National Associations of Hotels | |
2. | | Data Publicação: 1998 Col.autor: HOTREC-Confederation of the National Associations of Hotels | |
3. | | Data Publicação: 1998 Col.autor: HOTREC-Confederation of the National Associations of Hotels | |