References
- Burton , R. C. J. 1973 . “A new approach to perceptual capacity” . Recreation News Supplement , 1973
- Duffield , B. S. and Owen , M. L. 1970 . Leisure plus Countryside. A geographical appraisal of countryside recreation in Lanarkshire , Edinburgh : Edinburgh University . 1970
- North West Sports Council . 1972 . Leisure in the North West , London : Her Majesty's Stationary Office .
- Environmental Studies, Crewe and Alsager College, Alsager, Cheshire (U.K.)
- Department of Biology, University of Salford, Salford MS 4WT (U.K.).