1. Austin, T. 1974. Existing bodies of data—non-computerized. In: Oppenheimer, C. H.; Oppenheimer, D.; Brogden, W. B., eds. Environmental data management. New York: Plenum Press: 27–45.
2. Berkowitz, A. R.; Kolosa, K.; Peters, R. H.; Pickett, S. T. A. 1989. How far in space and time can the results from a single long-term study be extrapolated. In: Likens, G.E., ed. Long-term studies in ecology: approaches and alternatives.New York: Springer-Verlag: 192–198.
3. Buckley, D. J.; Coughenour, M. B.; Blyth, C. B.; O’Leary, D. J.; Bentz, J. A. 1993. Ecosystem management model—Elk Island National Park: a case study of integrating environmental models with GIS. Breckenridge, CO: Second International Conference on Integrating GIS and Environmental Modeling.
4. Burkman, W. G.; Hertel, G. D. 1992. Forest health monitoring. J. For.90:2.
5. Congalton, R. G. 1991. A review of assessing the accuracy of classification of remotely sensed data. Remote Sens. Environ.37:35–46.