APA (7th ed.) Citation

Reif, A. G. (2002). Assessment of stream quality using biological indices at selected sites in the Big Elk and Octoraro Creek basins, Chester County, Pennsylvania, 1981-97. [U.S. Dept. of the Interior, U.S. Geological Survey].

Chicago Style (17th ed.) Citation

Reif, Andrew G. Assessment of Stream Quality Using Biological Indices at Selected Sites in the Big Elk and Octoraro Creek Basins, Chester County, Pennsylvania, 1981-97. [Reston, Va.]: [U.S. Dept. of the Interior, U.S. Geological Survey], 2002.

MLA (9th ed.) Citation

Reif, Andrew G. Assessment of Stream Quality Using Biological Indices at Selected Sites in the Big Elk and Octoraro Creek Basins, Chester County, Pennsylvania, 1981-97. [U.S. Dept. of the Interior, U.S. Geological Survey], 2002.