1. Agee, J. K. and Johnson, D. R.: 1988, Ecosystem Management for Parks and Wilderness, University of Washington Press, Seattle.
2. Allen, T. F. H. and Starr, T.: 1982, Hierarchy: Perspectives for Ecological Complexity, University of Chicago Press, Chicago.
3. Angermeier, P. L., Neves, R. J. and Karr, J. R.: 1986, ?Nongame Perspectives on Aquatic Resource Management?, in J. B. Hale, Best, L. B., and Clawson, R. L. (eds.), Management of Nongame Wildlife in the Midwest: A Developing Art. North Central Section, The Wildlife Society, pp. 43?57.
4. Armentano, T. V. and Loucks, O. L.: 1983, ?Air Pollution Threats to US National Parks of the Great Lakes Region?, Environ. Conserv. 10, 303?313.
5. Ausmus, B. S.: 1984, ?An Argument for Ecosystem Level Monitoring?, Environ. Mon. and Assess. 4, 275?293.