APA (7th ed.) Citation

Trombley, T. J. (1992). Areal and temporal variations in surface-water quality in the upper Potomac River basin. U.S. Geological Survey.

Chicago Style (17th ed.) Citation

Trombley, Thomas J. Areal and Temporal Variations in Surface-water Quality in the Upper Potomac River Basin. Towson, Maryland: U.S. Geological Survey, 1992.

MLA (9th ed.) Citation

Trombley, Thomas J. Areal and Temporal Variations in Surface-water Quality in the Upper Potomac River Basin. U.S. Geological Survey, 1992.