1. Bishop, I.D., 1999. Modelling landscape change: visualisation and perception. In: Usher, M.B. (Ed.), Landscape Character: Perspectives on Management and Change. The Stationery Office, Edinburgh, pp. 150–161.
2. Elsner, G.H., Smardon, R.C., 1979. Our National Landscape: a conference on applied techniques for analysis and management of the visual resource. PSW-35, USDA Forest Service, Berkeley, CA.