1. USEPA, Elements of a State Water Monitoring and Assessment Program, 2003, EPA 841-B-03-003.
2. EEA, EEA environmental statement 2006, 2006.
3. EEA Report 2/2006 — Integration of Environment into EU Agriculture Policy — The IRENA Indicator-Based Assessment Report, EEA, 2006.
4. Water Pollution Control: A Guide to the Use of Water Quality Management Principles;Helmer,1997