APA (7th ed.) Citation

Spahr, N. E. (2004). Comparison of 2002 water year and historical water-quality data, upper Gunnison River basin, Colorado. U.S. Geological Survey.

Chicago Style (17th ed.) Citation

Spahr, Norman E. Comparison of 2002 Water Year and Historical Water-quality Data, Upper Gunnison River Basin, Colorado. [Reston, Va.]: U.S. Geological Survey, 2004.

MLA (9th ed.) Citation

Spahr, Norman E. Comparison of 2002 Water Year and Historical Water-quality Data, Upper Gunnison River Basin, Colorado. U.S. Geological Survey, 2004.