1. Adler, R. W., 1995. Filling the gaps in water quality standards: Legal perspectives on biocriteria. In Davis, W. S. & T. P. Simon (eds), Biological Assessment and Criteria: Tools for Water Resource Planning and Decision Making. Lewis Publishers, Boca Raton, FL: 345–358.
2. Angermeier, P. L., 1997. Conceptual roles of biological integrity and diversity. In Williams, J. E., C. A. Wood & M. P Dombeck (eds), Watershed Restoration: Principles and Practices. American Fisheries Society: 49-65.
3. Angermeier, P. L. & J. R. Karr, 1994. Biological integrity versus biological diversity as policy directives: protecting biotic resources. BioScience 44: 690–697.
4. Barbour, M. T., 1997. The re-invention of biological assessment in the U.S. Hum. Ecol. Risk Assess. 3: 933–940.
5. Barbour, M. T. & C. O. Yoder, in press. The multimetric approach to bioassessment, as used in the United States. In Wright, J. F., D. W. Sutcliffe & M. T. Furse (eds), Assessing the B ological Quality of Freshwaters: RIVPACS and Similar Techr iques. Freshwater Biological Association, London.