1. The place of carrying capacity in the management of recreation lands;Wagar;Rocky Mt High Plain's Parks and Recreation Journal,1968
2. Wilderness Management;Hendee;US Dept of Agriculture Forest Service, Misc Publication No 1365,1978
3. Die Landschaftsfresser, Tourismus und Erholungslandschaft Verderben order Segen;Krippendorf,1975
4. Resorts and Recreation Regions along the Mediterranean Littoral;Horowitz,1980
5. Environmental indicators for tourist areas;Juhasz;Leisure Studies Association Quarterly,1981