United States. Environmental Protection Agency. Office of Water. (1997). Watershed ecological risk assessment. U.S. Environmental Protection Agency, Office of Research and Development, Office of Water.
Chicago Style (17th ed.) CitationUnited States. Environmental Protection Agency. Office of Water. Watershed Ecological Risk Assessment. [Washington, D.C.?]: U.S. Environmental Protection Agency, Office of Research and Development, Office of Water, 1997.
MLA (9th ed.) CitationUnited States. Environmental Protection Agency. Office of Water. Watershed Ecological Risk Assessment. U.S. Environmental Protection Agency, Office of Research and Development, Office of Water, 1997.
Warning: These citations may not always be 100% accurate.