| 1. | Additional run for the EC market from the danish holiday analysis 1988 [[policopiado]] / Observa A/SData Publicação: [19--] Col.autor: Observa A/S - Instituttet for Erhvervsanalyser og Markedsforskning COTA(S): 89-CE |  | |
| 2. | Le tourisme Belge au Portugal : Rapport synthèse / Centre de Recherches en Gestion InternationaleData Publicação: 19-- Col.autor: Centre de Recherches en Gestion Internationale COTA(S): 369.1; 369.2 | | |