1. Adamus, P. R. and K. Brandt. 1990. Impacts on quality of Inland Wetlands of the United States: a survey of indicators, techniques, and applications of community level biomonitoring data. U.S. Environmental Protection Agency, Environmental Research Laboratory, Corvallis, OR, USA. EPA/600/3-90/073.
2. Anderson, J. R., E. E. Hardy, J. T. Roach, and R. E. Witmer. 1976. A land-use and land-cover classification for use with remote sensor data. U.S. Geological Survey, Reston, VA, USA. Professional Paper 964.
3. Andreas, B. K. and R. W. Lichvar. 1995. Floristic index for establishing assessment standards: a case study for northern Ohio. U.S. Army Corps of Engineer Waterways Experiment Station, Vicksburg, MS, USA. Technical Report WRP-DE-8.
4. Beatty, G. H., H. Henderson, C. Keener, and R. Gruver. 2002. Vascular plants of Centre County, Pennsylvania and their coefficients of conservatism: plants of Upper Penns Creek Watershed, documented and probable. Pennsylvania Native Plant Society and Pennsylvania Department of Environmental Protection, State College, PA, USA.
5. Bedford, B. L. 1996. The need to define hydrologic equivalence at the landscape scale for freshwater wetland mitigation. Ecological Applications 6: 57–68.