APA (7th ed.) Citation

Barker, J. L. (1986). Temporal changes in sulfate, chloride, and sodium concentrations in four eastern Pennsylvania streams. U.S. Geological Survey.

Chicago Style (17th ed.) Citation

Barker, James L. Temporal Changes in Sulfate, Chloride, and Sodium Concentrations in Four Eastern Pennsylvania Streams. Harrisburg, Pennsylvania: U.S. Geological Survey, 1986.

MLA (9th ed.) Citation

Barker, James L. Temporal Changes in Sulfate, Chloride, and Sodium Concentrations in Four Eastern Pennsylvania Streams. U.S. Geological Survey, 1986.