1. Adams, D. L., and F. W. Barrett. 1976. Stress effects on bird-species diversity within mature forest ecosystems.American Midland Naturalist 96:179–194.
2. Barbour, M. G., J. H. Burk, and W. D. Pitts. 1980. Terrestrial plant ecology. Benjamin Cummings Publishing, Menlo Park, California, 604 pp.
3. Block, W. M., L. A. Brennan, and R. J. Gutierrez. 1984. The use of guilds and guild-indicator species for assessing habital suitability. Pages 109–113in J. Verner, M. L. Morrison, and C. J. Ralph (eds.), Wildlife 2000: Modeling habitat relationships for terrestrial vertebrates. The University of Wisconsin Press, Madison, Wisconsin.
4. Brooks, R. P., and M. J. Croonquist. 1990. Wetland, habitat, and trophic response guilds for wildlife species in Pennsylvania.Journal of the Pennsylvania Academy of Science 64:93–102.
5. Brooks, R. P., D. E. Arnold, E. D. Bellis, C. S. Keener, and M. J. Croonquist, 1991. A methodology for biological monitoring of cumulative impacts on wetland, stream, and riparian components of watersheds. Pages (in press)in J. A. Kusler, and G. Brooks (eds), Proceedings of an international symposium: Wetlands and river corridor management. Association of Wetland Managers, Berne, New York.