1.		Tourism resources in Eastern Europe: Poland, Hungary, Czecholovakia, Yugoslavia and Bulgaria / Commission of European Communities. Tourism Unit DG XXIII Data Publicação: 199? Col.autor: Comunidade Europeia. DG XXIII
2.		Tourism in Eastern Europe and the Soviet Union : prospects for growth and new market opportunities / by Éva Kerpel Autor: Kerpel, Éva Data Publicação: 1990 Co col. autor sec.: EIU