APA (7th ed.) Citation

Brightbill, R. A., & Koerkle, E. H. (2003). Relations of biological indicators to nutrient data for lakes and streams in Pennsylvania and West Virginia, 1990-98. U.S. Dept. of the Interior, U.S. Geological Survey.

Chicago Style (17th ed.) Citation

Brightbill, Robin A., and Edward H. Koerkle. Relations of Biological Indicators to Nutrient Data for Lakes and Streams in Pennsylvania and West Virginia, 1990-98. New Cumberland, Pa.: U.S. Dept. of the Interior, U.S. Geological Survey, 2003.

MLA (9th ed.) Citation

Brightbill, Robin A., and Edward H. Koerkle. Relations of Biological Indicators to Nutrient Data for Lakes and Streams in Pennsylvania and West Virginia, 1990-98. U.S. Dept. of the Interior, U.S. Geological Survey, 2003.