1. S. Ostrowski, ‘Report on the integration of European tourist supply’, Doc. CRTE /X/ V.1/a/, Department of Tourism Poland.
2. Planning and Development of the Tourist Industry in the EEC region,1976
3. Planning and Development of the Tourist Industry in the EEC region,1976
4. S. Ostrowski, ‘Over-all strategies and policy measures for the implementation of tourist development plans’, pp 1.